thats disgusting. you're right, FYL op

OP: I'm guessing the feeling isn't mutual, so here's some unrequested advice. Tell your co-worker, politely but unambiguously, that you are not interested and that you would prefer not to receive any more "notes". Believe it or not, direct and respectful communication does work in most cases. If the unwelcome advances persist, there are rules and resources for handling it. In the meantime, don't overreact.

Fyl. I would be so creeped out if that happened to me.

I have done that! It sucks big time!!

Is he rich? Because if he is, that changes everything. Just kidding. It is very gross when someone who could be your grandpa hits on you. Especially when the person is also married to your grandma. Oh wait, that's my life, not yours. FYL.

Sexual harrassment. Just tell your boss if you feel uncomfortable about it. :P

Don't you retire at age sixty to sixty-five?

sexual harassment... here we go.

I wonder if he can still get it up.

Awww! That's so cute! I bet if he were 50 years younger you'd jump at the opportunity. Don't discriminate against old people!