It's called aging, my friend. If aging in itself affects medical status, we're all in trouble.
I'm 54. My shoulders are sore (lots of swimming when I was younger - still do it some), achy lower back (lots of things), arthritis and missing cartilage in my left knee (American football), and several previously broken bones and previously sprained (and broken) ankles (motorcycles and football). My hearing ain't so hot, either, and I wear multifocals. I also use Advair and Vasotec. Everything on my damned body clicks - and sometimes hurts - but everything still works, sort of. My medical exams go just fine. So will yours.
others say gas release.
Yeah, that too.