You caused so much mischief as a child, I’m scared to see what you’re going to do as an adult.

Welcome to the club of adulthood. However, we’d prefer it if you didn’t let the police know because otherwise we’ll soon meet you behind bars.

You’ll soon find out that being an adult is much less exciting than being a child. But shhhh, don’t tell anyone. That’s our secret.

I hope you wake up tomorrow and realize how lucky you are to have had me as a friend for so many years. But that’s tomorrow. Today is about you.

Now is the time to decide what kind of person you are going to be, which is much more important than deciding on your career. Choose wisely!

The choices you make today determine where you’re going to be tomorrow. Make good ones!

Now you’re an adult. Please grow up, but never grow old. Please.

Happy birthday! Best wishes for your 18th!

Happy 18th birthday to one of my dearest friends! Today is surely a day to celebrate!

Happy birthday to one of the coolest people I know!

I like so many things about you, they won’t all fit in this card. Just know that I wish you a very happy birthday!

You are sweet, beautiful, and kind. On your birthday, I hope you stay well.

The more you give, the more you get. Remember that I’ve given you a lot over the years.

The world changed when you came into it. As you grow up, I hope you continue to make it a better and happier place.

I want you to know how much I appreciate you as my friend and that I respect your honesty and simplicity. I wish you a very happy birthday!

Though part of me is sad to see you grow up, I’m also excited to see the woman that you’ve become. We are proud of you.

Even though you may have fewer chances to play dress up, I hope you’ll never stop playing.

You were adorable as a child, and you are beautiful as a woman. But the best part is who you are on the inside.

Our affection for you grows day by day. Enjoy your 18th birthday, sweetheart!