Thanks for your question. Dr Fong has given you an excellent answer so I won’t repeat what he has said, but I would certainly advocate assessment and treatment for back pain symptoms. Having had personal experience of it, I know that it can be frustrating and limit your activity.
While there might be a degenerative element to things, often symptoms settle with physiotherapy, activity and lifestyle modification and other treatments such as acupuncture or cupping. Although degenerative changes might not self resolve, symptoms do tend to improve and invasive treatments are often not required.
I would suggest that your dad sees a MSK/Sports Physician it physiotherapist in the first instance for an assessment. This will include a clinical history and examination and appropriate investigations.
Hope things get better for your dad.
Bw
Dr Dinesh