You know you are old when you watch the sports coverage on the news, and when they interview all these multi-zillionaire pro athletes, you realize that for most of them, you are old enough to be their dad.
I recall when I was a kid, and they were all "grown-ups" to me, and now they are all very young to me, and, somehow, I dont recall a time when I was aware of being the same age as them... it's like I skipped over that, not sure WTF happened there.