I would say both. Yes this is likely due to his aging system but there may be something you can do to help him feel better and get more control back.
Veterinary medications for arthritis and pain might help. Glucosamine chondroitin or Adequan shots might help too. Your regular vet can help you with that.
A holistic vet may be able to help with alternative treatments such as accupuncture or chiropracty. You can see if there is a vet near you offering this on this page
http://www.holisticvetlist.com/#search
Hope this helps you!
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