Most probable cause at this age is osteoarthritis... It's a degenerative bone disease...There’s no cure for osteoarthritis as yet, but there are a number of treatments that can help ease symptoms and reduce the chances arthritis becoming worse...options are analgesics, NSAIDs,intraosseous steroid injection and hyaluronic acid injections,Physiotherapy like strengthening exercises etc ... Treatment depends upon the stage...I would suggest you to consult nearest orthopedic surgeon they will do the needful.
If it's in one leg ...get her MRI lumbosacral spine done to rule out Lumbar PIVD and consult some pain specialist
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