i got some bad news...
real answer is, of course, to focus on whatever your company's Best Practices are (i worked in supply chain/warehouse for awhile and did the same kind of work, so i feel you) and then go two steps further and do even better. similarly, start stretching - especially when you first wake up - and giving yourself a breather throughout the day to stretch out your legs and knees here and there. lots of water, just in general. maybe take up light yoga. try not to gain any weight, if it helps (i know it sounds silly, but over the past year or so i had gained like, 30 pounds; my legs and knees started hurting more than they ever had previous to that, while doing much less intensive work).
basically, do what you can to mitigate aging, as well as you can. but also, like, temper your expectations. i see tons of old people in my line of work - some in their 60s who cant walk up the stairs to their room, but also a couple in their 80s who - just today - biked 30 miles in the heat to go golfing at a local resort. so, who knows.
