Fitness help: how to strengthen my joints and slow the aging process on them?

Sara413
I have weak knees and other joints, which are getting worse as I age. I want to get more into running but I find its getting more difficult because of the impact to knees and hips. I also sprained my ankle last summer, which I'm still trying to bounce back from.

I take salmon oil several times a week and cook with olive oil quite a bit. I've ordered collagen powder, which I intend to start taking every morning, having read that it helps with joint pain and other aging related physical problems.

A friend has asked me to run a half marathon with her this summer and I really want to do it. But I am afraid of what the training process might do to my knees. I used to run 10-20 km on the regular and fitness wise I'm definitely able to do it. I'm just worried about my knees.

Does anyone have any other tips or ideas for what I can eat or do to strengthen my joints and slow the aging process? Thanks!!!
Updates:
+1 y
Ok to clarify, it's not like my joints are awful and useless. I walk a lot and they're not sore after an ordinary day. But they have always cracked a lot and it's getting worse. Doing things like squats they crack a lot and it's uncomfortable and after running long distances they get a bit sore.

Please don't just express shock at me having joint problems at 29 and not offer any advice. If you have no tips about what I can EAT or what exercises may help, please don't bother commenting.
Fitness help: how to strengthen my joints and slow the aging process on them?
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