Happy birthday, sis! Although you can’t rewind and get any younger, at least we can stop counting from this year onwards to make sure you don’t get any older!
Today is your special day so I won’t make it all about me, but as you turn another year older I can’t help but be reminded of the fact that I’m even older than that! Thanks a lot!
As your elder sibling, it’s my duty to boss you around and act as though you’re always bothering me but seeing as today is your special day I’ll give you a break!