Which exercise will do without wiping out billions of fish and screwing up the food chain the ocean. https://www.nytimes.com/2018/11/10/well/live/vitamin-d-and-fish-oils-are-ineffective-for-preventing-cancer-and-heart-disease.html

and in general, fish oil is NOT what it's promised. Eat fish more often. Get outta the damned chair and MOVE. Funny how those things fix so many of the aging ills you list here.