No question that physical activity can become more difficult as we age. I'm 60 and have battled low-level chronic back pain and hip pain for years, so I'm familiar with the challenge of "getting out there" anyway, finding something that works. I've offered some suggestions here: https://robertroybritt.medium.com/the-no-excuses-guide-to-physical-activity-36e40cb5d8f8

And that article links to another, from the CDC, which has suggestions for how adults with disabilities can find ways to move: https://cdc.gov/ncbddd/disabilityandhealth/pa.html