[insert age] is a perfect age. You're old enough to recognize your mistakes but young enough to make some more. Happy Birthday!

You're [insert age]? Better take that cake outdoors to light the candles! Have a very happy birthday.

Happy Birthday! Don't forget to iron that birthday suit.

Happy Birthday to someone who radiates calm! One day you'll have to teach us your secret to staying cool under pressure. Thanks for keeping the rest of us sane.

Dear [name], Happy Birthday! Thanks for answering all my questions and helping me settle in since I joined the team. I've learned so much from you!

Dear [name], it's amazing how you keep things running smoothly around here. Thanks for keeping us all organized. Happy Birthday and many happy returns!

Happy Birthday to one of the most smiley people in the office! Thanks for making our office a brighter place with your sunny attitude.

Happy Birthday to one of the most productive people around here! Someday you'll have to teach us your secret to getting so much done.

Happy Birthday to my office buddy! Thanks for making work such a great place to be. I hope you have a wonderful day and a brilliant year ahead!

Work just wouldn't be as much fun without your company! Thanks for all the great coffee breaks and sharing the load. Hope you have a great birthday today!

Many happy returns on your birthday today from all of us at [insert company name]. We hope you have a wonderful day!