It’s natural for people to want to care for the elderly, so don’t be surprised if they start offering you help when crossing the street! Happy birthday, old lady!
I wanted to write you a funny birthday message, but then I realized that making a woman of your age laugh too much could be a risky move! Happy birthday!
Forgetfulness is just another part of growing old, but at least in your old-age you haven’t forgotten how to throw a great party! Happy birthday, lovely lady!