As a young teenager, I once went with my grandparents and their fellow pensioners, to see some community theater.

They were all retirement age and then some, and I must have been the only "kid" on that bus. Let me tell you, the ones that didn't pick up that I was there swore like sailors (they actually were) and acted like... potty-mouthed teenagers! I was floored by this revelation.

I've had other moments of observation with older folks over the years, and I keep seeing the same thing. At the same time, I've paid attention to the growing disparity between my apparent and "mental" ages. So, that sensation that you have to remind yourself that you're no longer 19 or whatever? It may be a different point in life for everyone, but as far as I can tell, that doesn't stop.

What does change is your body and the face you see in the mirror. That alone changes how you see everyone else, their age, and how it all relates back to you socially. You don't have to like it, but it's probably wise to get used to it. :/