My dad had knee problems when he was older because of a career with a lot of manual labour - that means when you do get old you are less mobile which leads to o

My dad had knee problems when he was older because of a career with a lot of manual labour - that means when you do get old you are less mobile which leads to other health problems... I'm in my 50s myself now and while I have some other health problems my knees appear to be fine - not something I can say about people who were in the infantry or played sports professionally who are now all suffering quite badly.