Yes your right, your scoliosis isn't going to change and is most likely not the cause of your pain. Just keep getting movement in your lower back. Low impact exercises such as pedaling on stationary bike, swimming. Balance exercises are great also to activate proprioceptor muscles in your back. These muscle stabilize the spine and they atrophy as we age because we don't use them. These muscle just need activated they aren't the kind of muscle you need to build up. A lot of these therapist put everyone through the same protocols if your 25 or 85 and it is kind of idiotic.