Happy birthday to my younger sister who a lot of people think is actually my elder sister!
I’m sure it’s only because you’re so wise and mature that people think you’re older than me anyway, sis! Either that or I just seem super young and immature!
I am a true friend, buddy. I’ll always remember your birthday but as a courtesy and out of respect for you, I’ve chosen to stop keeping track of your age!
In my mind, you’re only as old as you feel! Happy birthday to you!