Dear Mr. Smith,
I would like to take this opportunity to say...
It's weird getting old, isn't it? I know.
Thank you for spending your special day working your pants off for your family.
Thank you for being born on such a beautiful day, and for appreciating that you'll forever celebrate your birthday at Mass.
Thank you for being you, the best husband and father, ever.
I will try my best to keep the children from calling you Old Man when they see you.