The other day somebody called me a “grumpy old man.” (And no, this wasn’t the first time I’ve heard that. Not by a longshot.) I think it was supposed to be a pejorative, but I found both concepts – being “grumpy” and being “old” exhilarating.
To me, it meant that I’m self-aware enough to refuse to take any crap and that I have enough years on me to have actually grown up a bit.
My joy was complete when I discovered this image:
The clickable version is 
8-12-86