21st Birthday Card Messages: What To Write

Published on: April 29, 2024

You may be able to do everything at 18 that you used to be able to do at 21, but a 21st birthday is still a big a milestone in many people’s eyes! 21 means that you’re officially living out your 20s, so make sure the message you put inside their 21st birthday card shows your support and love. To help you out we’ve compiled a range of messages you could write in their card (of course with your own personal touch)…

Sentimental 21st messages

Show them some love with a sentimental message that’ll warm their heart…

Let’s celebrate 21 years of amazing memories with many more to come. Happy birthday to a very special person!
Another year, another big milestone! Keep being amazing as you go through your 20s, happy birthday.
Happy birthday, keep being you and 21 will be your year!
Your journey into adulthood has just begun and I’m excited to see what your future holds, so happy 21st birthday to you.
Turning 21 is a big deal and this special day indicates the start of an exciting journey. I hope you have a great 21st birthday.
Wishing you all the best for this milestone of your life! Happy 21st birthday!
You only turn 21 once so let’s celebrate and make it special.
21 is a big milestone, so I just wanted to say I’m proud of you and everything you’ve accomplished so far.

Funny 21st messages

If you want to make them chuckle then throw in a funny line or two…

9 years until you’re 30, let the countdown begin!
Happy birthday, you’re one step closer to the big 3-0 so it’s all downhill from here.
Happy 21st, let’s celebrate with dreadful headaches in the morning!
It seems like yesterday you were a clueless 20-year-old and now you’re a clueless 21-year-old, happy adulthood.
I know it’s your 21st birthday, but there’s enough alcohol to go around, so no need to get sloppy drunk like your 18th.
No matter what happens, you’ll never be underage again. Happy 21st!
Even though you’re 21 now, don’t grow up because the world is scary and

Messages to a Friend

Now you can both live life in your twenties together, show your bestie how excited you are to finally be adulting together…

We’re officially in our 20s now so let’s keep having fun before we get too old (30). Happy 21st!
I’m excited we’re both 21, but now we’re getting old the hangovers really are much worse. Happy 21st bestie!
Happy 21st! Have a day as wonderful as you are, we’re all very excited to celebrate with you.
To my lovely friend, I hope you have an amazing day and I’m excited to make more memories with you.
Happy birthday to one of the nicest people I’ve ever known, you are my best mate in the world.
Happy 21st birthday to my best friend. I don’t know where I’d be without you and I’ll always be grateful for your company.
Have a very happy 21st birthday and I hope that we continue to celebrate together until we’re grey and old.
Happy 21st birthday to you, can’t wait to live out the rest of our twenties together.

Messages to a Son/Daughter

It must be bizarre to have a child that’s an adult now, so if you’re lost for words we’ve got a few lines for you…

Turning 21 is a big deal, but this special day is just the beginning of great things to come. I hope you have an amazing 21st birthday.
Happy 21st birthday Son/Daughter! We’ve had the joy of seeing you through 2 decades, now go out and enjoy the rest.
We can’t believe you’re 21 now. It’s the best time of your life to create special memories so go out and have fun. Happy 21st birthday!
Happy 21st, you make us proud every day, now go and celebrate!
We can’t believe our little boy/girl has finally turned 21 and what an amazing adult you have become. Happy 21st birthday!
Wishing you a very special year because you deserve it! Happy 21st birthday.
Happy birthday Son/Daughter, I’ve been proud of you every day since you were born and I am even more proud of you now you’ve turned 21.
At 21, you’ve officially crossed into adulthood, but you’ll always be my little boy/girl. Happy birthday!

Messages to a Grandson/Granddaughter

The grandkids are getting bigger by the second so make sure not to miss their 21st with a nice message they won’t forget…

Happy 21st birthday Grandson/granddaughter, we hope your future will be as bright as this special day.
At 21, you’re not just older; you’re also wiser and more amazing every day. Wishing you the best birthday ever!
Happy 21st birthday to my lovely grandson/granddaughter, we wish this year will be filled with love, laughter, and incredible memories.
Happy 21st birthday! Make the most of your 20s because before you know it 60 years will go by and you’ll be looking like me.
Warm wishes on your birthday from your loving Granddad/Grandma.
We are so proud of you and all your magnificent achievements, have an amazing birthday!
To our amazing Grandson/Granddaughter, we are so lucky to have you, you are so kind, smart, and thoughtful. Happy 21st birthday.
We’re so proud of the responsible and caring young man/woman you’re becoming. Keep working hard and chasing your dreams. Happy 21st to our Grandson/Granddaughter!

Once you’ve thought of the perfect message make sure to take at look at our 21^st birthday cards to see if one catches your eye. Find our whole range of 21^st birthday cards on our website! And whilst you’re there, take a look at the many personalised gifts and specifically 21^st birthday gifts that we have online. You’re bound to find something perfect for that special someone.