I have a tumor on my right hip, right at the joint, that is benign but sizeable and due to its pressure it sometimes gives me hip pain. My lungs are shot due to growing up with heavy chain smoking parents while being allergic to cigarette smoke and then also having pneumonia as a child in combination- they are my biggest weakness in any activity and it makes me angry. I am deaf in one ear so I never hear cars coming up (a rearview mirror is necessity for me!). I have small rocks embedded in one knee from a childhood crash and they sometimes grind against the bone so a bit of knee pain at times. Also strangely I have a toe on each foot (the ones next to each big toe) where the socket is too shallow so my toes will just randomly pop out of socket! It is a hereditary thing, my brother and daughter have it on the exact same toes. It is terribly inconvenient when it happens not only cycling but while walking around at work, driving, or having that toe-curling moment at home...
Overall just little crackly stuff, and others that don't come into play while cycling, but I consider myself fairly healthy and active. Good on everyone here for not letting physical stuff get in the way of what you love!!!