When you're young, your body works perfectly pretty much. The first time you develop an issue with your senses for example, it is quite shocking; going from a state of perfection to imperfection, you focus on that one flaw.
As I age and more stuff is not working optimally, I have just stopped giving a shit about these sort of issues, adopting a 'even the mona lisa's fallin apart' attitude. I dont focus on the flaws, I focus on what I can still do. Even if I'm only physically operating at 80% of my former capacity, say, I'm still capable of accomplishing what I want to if I apply myself.