18th and 21st Birthday Wishes: What to Write in the Card

The best 21st birthday wishes and 18th birthday wishes do two things: they mark a big milestone and they tell the person how proud you are of them. At 18 someone becomes a legal adult, and at 21 they reach the legal drinking age in the United States.

Below are 95 messages you can copy into a card for a son or daughter, a grandchild, a niece or nephew or a friend, plus funny wishes, money messages and Bible verses.

Article contents

• How to Write an 18th or 21st Birthday Card
• Happy 18th Birthday Wishes
• Happy 21st Birthday Wishes
• Birthday Messages to Write With Money or a Gift
• Religious 18th and 21st Birthday Wishes and Bible Verses
• Frequently Asked Questions

How to Write an 18th or 21st Birthday Card

1. Name the milestone. Writing "Happy 18th" or "Happy 21st" makes it clear the card was chosen for this birthday.
2. Say one thing you are proud of. Mention a choice they made, how hard they worked or how they treat other people.
3. Look ahead to what comes next. This could be college, a first job, a move to a new city or simply the year ahead.
4. Add advice only if you are close. Parents and grandparents can share one short piece of advice, while friends can keep it light.
5. Close with love and your name. A warm sign off such as "Love always" or "So proud of you" finishes the card well.

Example: "Happy 18th birthday, Jake! We are so proud of how hard you worked this year and how kind you are to your little brother. College is going to be lucky to have you. Love, Mom and Dad"

Happy 18th Birthday Wishes

An 18th birthday often falls in the same year as graduation, so many of these messages mention the next step.

Short 18th Birthday Wishes

• Happy 18th birthday! Welcome to adulthood.
• Eighteen looks good on you. Have a great birthday.
• Happy 18th birthday! The best is yet to come.
• Happy 18th! This is going to be an exciting year for you.
• Happy birthday! Eighteen is a big one, so celebrate it well.
• Cheers to 18 and everything that comes next.
• Happy 18th birthday! You have worked hard to get here.
• Wishing you a wonderful 18th birthday and a great year ahead.

18th Birthday Messages for a Son

• Happy 18th birthday, son. Eighteen years ago you changed our lives, and we are so grateful you did.
• Legally you are an adult now. To us, you are still the boy who ran into our room during thunderstorms. Happy 18th.
• We have watched you grow into a smart, caring and capable young man. Happy 18th birthday.
• Happy 18th, son. Wherever the next few years take you, home will always be here.
• Eighteen years of school drop offs, practices and late night talks. We would do every one of them again. Happy birthday.
• You are ready for whatever comes next, and we believe in you. Happy 18th birthday, son.

18th Birthday Messages for a Daughter

• Happy 18th birthday, sweetheart. Raising you has been the best thing we have ever done.
• Eighteen years ago we held you for the first time. Today we are so proud of the young woman you have become.
• You will always be our little girl, even now that you are officially an adult. Happy 18th.
• Watching you grow up has been our greatest joy. Happy 18th birthday, darling.
• Happy 18th to the girl who used to borrow my shoes and now borrows the car. I love you so much.
• You have a big heart and a strong mind. Use both well, and have the happiest 18th birthday.

18th Birthday Wishes for a Granddaughter, Grandson, Niece or Nephew

• Happy 18th birthday to my wonderful granddaughter. I am so proud of who you have become.
• Happy 18th birthday, grandson! It feels like yesterday you were riding your bike up and down our driveway.
• Eighteen already! Grandpa and I love you and cannot wait to see what you do next.
• Happy 18th birthday! No matter how grown up you get, you will always have a place at our table.
• Happy 18th birthday to my favorite niece. You are going to do great things.
• Happy 18th, nephew! Enjoy this year, and call me if you ever need advice.
• I have loved being your aunt for 18 years. Happy birthday, and here is to many more.
• Eighteen looks great on you, buddy. Happy birthday from your favorite uncle.
• Happy 18th birthday to my nephew. Remember that I am always here for you, no questions asked.

Funny 18th Birthday Wishes

• Happy 18th! You can vote now, but you still cannot pick the music in our car.
• Congratulations on turning 18. Your first adult task is writing a thank you note for this card.
• Happy 18th birthday! You are officially an adult, so the laundry is all yours now.
• Eighteen means you can sign your own permission slips. Please use this power wisely.
• Happy 18th! Being an adult mostly means knowing where the spare batteries are.
• Happy 18th birthday! You are now old enough to call and make your own dentist appointments.
• Eighteen years old and you still ask what is for dinner. Happy birthday anyway.

18th Birthday Messages From Parents With Advice

• Happy 18th birthday. Be kind, work hard and call home more than you think you need to.
• As you start this new chapter, remember that it is okay to ask for help. We are always one phone call away. Happy 18th.
• Our advice for your 18th year: save a little of every paycheck, get enough sleep and keep good friends close. We love you.
• Happy 18th birthday. You will make some mistakes, and that is part of growing up. Learn from them and keep going.
• Stay curious, stay honest and always be kind to people who cannot do anything for you. Happy 18th, with love from Mom and Dad.
• You do not need to have it all figured out at 18. Take it one step at a time, and know we are behind you. Happy birthday.

Happy 21st Birthday Wishes

A light joke is fine in a 21st birthday card, but from family a wish for a safe and happy celebration is usually best.

Short 21st Birthday Wishes

• Happy 21st birthday!
• Happy 21st! Celebrate safely and have a great night.
• Cheers to 21 years! Have the best birthday.
• Happy 21st birthday. This is going to be a great year for you.
• Wishing you a very happy 21st and a year full of good things.
• Happy 21st! Enjoy every minute of your big day.
• Cheers to you on your 21st birthday.
• Happy 21st birthday to someone who is just getting started.

21st Birthday Wishes for a Son

• Happy 21st birthday, son. You have grown into a man we admire and a friend we love spending time with.
• Twenty one years ago we became your parents, and it is still our favorite job. Happy birthday.
• Happy 21st birthday, son. We are so proud of the choices you make and the person you are.
• Happy 21st! Celebrate, be safe and call us in the morning.
• You will always be our boy, even at 21. Happy birthday, and we love you.
• Happy 21st, son. Raise a glass to yourself today. You have earned it.

21st Birthday Wishes for a Daughter

• Happy 21st birthday to our amazing daughter. We are proud of you every day.
• Twenty one years of loving you, and it gets better every year. Happy birthday, sweetheart.
• Happy 21st birthday! You have become a strong, thoughtful woman, and we are so lucky to be your parents.
• You will always be our baby girl, even at 21. Happy birthday, darling.
• Happy 21st, sweetheart. Have fun, stay safe and text us when you get home.
• Happy 21st birthday to a daughter who makes us laugh, makes us proud and makes every family dinner better.

21st Birthday Wishes for a Friend

• Happy 21st to my favorite person to celebrate with. The first round is on me.
• Twenty one years young and still the best friend a person could ask for. Happy birthday!
• Happy 21st birthday! I am so glad we get to celebrate this one together.
• Here is to 21, and to many more years of being ridiculous together.
• Happy 21st! Thanks for every laugh, every late night and every road trip.
• You have been there for every big moment, and I am so happy to be here for this one. Happy 21st.
• Happy 21st birthday to my best friend. Let us make tonight a story we will tell for years, in a good way.

Funny 21st Birthday Wishes

• Happy 21st! Your ID no longer has to do all the talking.
• Congratulations on turning 21. The bouncer is finally going to be nice to you.
• Happy 21st birthday! Tomorrow morning, water and toast are your best friends.
• You are 21 now, which means you are old enough to pretend you know what wine goes with pizza.
• Happy 21st! Please send photos, and please do not send all of them to Grandma.
• Happy 21st birthday! Remember that a good night ends with a sandwich and a ride home.
• Congratulations on reaching the age where your idea of a wild night will soon be a good movie and an early bedtime.

Birthday Messages to Write With Money or a Gift

Cash and gift cards are popular gifts at 18 and 21. Mention the gift in your message so it does not get thrown away with the envelope. If you are not sure how much to give, our guide to how much money to put in a card can help.

• Happy 18th birthday! Here is a little something for your dorm room. Spend it on something you need, or something fun.
• A little birthday money for your next adventure. Happy 21st!
• Happy 18th! Put this toward books, gas or pizza. We will not ask which one.
• For your 21st birthday, here is a little something to start your savings. Your future self will thank you.
• Happy birthday! This gift card is for coffee during finals week. We are proud of how hard you work.
• Happy 18th birthday. This is for your first apartment fund. We cannot wait to visit.
• Here is a little birthday cash. Please spend it on yourself and not on your roommates. Happy birthday!

Religious 18th and 21st Birthday Wishes and Bible Verses

These Bible verses are from the New International Version (NIV). Write the verse and its reference, then add a short personal note.

• "I will instruct you and teach you in the way you should go; I will counsel you with my loving eye on you." (Psalm 32:8)
• "For I know the plans I have for you," declares the LORD, "plans to prosper you and not to harm you, plans to give you hope and a future." (Jeremiah 29:11)
• "Trust in the LORD with all your heart and lean not on your own understanding; in all your ways submit to him, and he will make your paths straight." (Proverbs 3:5-6)
• "Don't let anyone look down on you because you are young, but set an example for the believers in speech, in conduct, in love, in faith and in purity." (1 Timothy 4:12)
• "The LORD bless you and keep you; the LORD make his face shine on you and be gracious to you; the LORD turn his face toward you and give you peace." (Numbers 6:24-26)
• "Being confident of this, that he who began a good work in you will carry it on to completion until the day of Christ Jesus." (Philippians 1:6)

Religious Birthday Wishes for an 18th or 21st

• Happy 18th birthday. As you start this new chapter, may God give you wisdom, courage and good friends.
• Happy 21st birthday. We pray that God keeps you safe and guides every step you take.
• We thank God for the gift of you, today and every day. Happy 21st.
• Happy 18th birthday. May your faith stay strong as you make your own way in the world.
• On your 18th birthday, we are praying for God to bless your plans and lead you where you are meant to be.
• God has been faithful through every one of your 18 years, and He will be faithful in the years ahead. Happy birthday.

Frequently Asked Questions

What do you write in an 18th birthday card?

Wish them a happy 18th by name, tell them one thing you are proud of and add a wish for what comes next, such as college, a first job or simply a great year. Parents and grandparents can also add one short piece of advice.

What is a good message for a 21st birthday?

A good 21st birthday message is warm and a little fun, such as "Happy 21st! Celebrate safely and have a great night." From a parent or grandparent, add a line about how proud you are of the person they have become.

Is it okay to joke about drinking in a 21st birthday card?

A light joke is fine for a friend who will enjoy it. Keep it gentle and avoid anything that encourages heavy drinking. From a parent, grandparent or coworker, a wish for a safe and happy celebration is usually the better choice.

Should I put money in an 18th or 21st birthday card?

Cash or a gift card is a common and welcome gift at both ages, especially for someone starting college or living on their own. Mention the gift in your message so it is not missed, and give whatever amount feels right for your budget and your relationship.

For more milestone ideas, see our sweet 16 birthday wishes and 30th and 40th birthday wishes. Parents writing to a son can find more ideas in our birthday wishes for son guide, and if the 18th birthday lands near the end of senior year, our graduation wishes may help too.

Our Happy Birthday Assorted Cards are blank inside, so you have room to write any of these messages.

Milestone birthday wishes: sweet 16, 18th and 21st, 30th and 40th, 50th, 60th and 70th, 80th and 90th.