Best reason yet NOT to procrastinate when you're over 50:
Because that thing you told yourself you wanted to do, but you'd do it "later"? By the time "later" comes around, you won't remember what it was you wanted to do in the first place.
Seriously, this just happened to me. AGAIN. I was going to look up something (on Facebook? Google? Who the hell knows?) and 30 seconds later, I forgot what it was I wanted to look up. I know it will come back to me eventually but DANG this is annoying.