Neck and back problems tend to increase with age. The reason is that most spines, over time, will degenerate and weaken. But this is highly variable and quite mutable too. Present research suggests that genetics plays a large role in degeneration, but I think potent interventions can mitigate that considerably.
Most of the people that I treat will get over their pain, and stay better for many months or several years. If the person is older, with a lot of degeneration (arthritis), it is more likely they will have a recurrence of pain and need occasional treatment. But that is usually not very often.