My 69 year old knees & eyesight have both improved (especially my eyesight).
I heard about "Bromelain" - an enzyme in pineapple that (over time) helps dissolve those floaters some of us get in our eyes as we age. The same enzyme also helps arthritis. I've been having some pineapple for breakfast for the past year. I now see floaters only when I try hard to see them. Previously, a computer screen really brought them out.
Scoff all ya want, but I had an eye exam recently & the optometrist said, "Well, your last eye exam was 3 years ago & your eyesight was just "OK," but now it's 20/15 which is better than perfect."