memes

I think the issue is that if you had injuries at younger age, those injuries become inflamed again as you become older. There are athletes who said their injuries become inflamed again when they hit 30's. There are also soldiers who passed away after their old wounds became a problem again at old age. The body just can't keep up repairing itself anymore.

However, old injuries isn't just the only explanation. If one have hardly been sporty or did labour intensive jobs at younger age and feeling pain on the knees, it could be genetics. If not, then it is something entirely within the person's control: overweight. I have friends who gained weight tremendously over the years even though we are only in our early 30's. One of my friends could hardly walk for long at a pretty short distance. I reckon it is because they work from home and don't do any exercise (some of them became too jaded and insecure over the years to go to gym), while I and my other friend work on-site so we have more physically demanding jobs and we still do exercise.