ways to tell you're old

1. You see a teen or 20-something out walking around in public in an outfit you totally would have worn, without question, in your teens or 20s -- and you think to yourself -- "OMG! How can they leave the house like that? Do they not KNOW how stupid they look?"
2. The authority figures in your life -- bosses, doctors, whatever -- suddenly all are younger than you. By decades, in a number of instances. Or, suddenly, to a significant group of people, YOU are the authority figure (i.e., really old fart).
   
3. You would rather stay in and have a civilized glass of wine and a small, sedate dinner party with your nearest and dearest than go out with a huge group of people -- many of whom you only marginally know -- get blitzed on cheap beer, and snarf greasy pizza at 3 a.m.
4. You have high school friends who are grandparents already.

It totally has been one of those days. Anybody want to add to the list??