When a man gets to a certain age do they try to run away from their age?

I had a thought about this recently, well simply I've found that my grandparents seem more alive when they're surrounded by people, especially younger people.

It's like they draw their energy and motivation to keep going from the grandchildren etc.

And I wondered if that's what happens in relationships when people reach middle age.

If your partner starts to show signs of age via ailments does a switch go off inside your head that makes you think "that shits contagious" or something?