Over the last 2-3 months, I started doing some stretching exercises. I started with the dose so minute, I won't even mention it, but, step by step, mercilessly slowly, I added more. At first, I didn't really even count on much progress - I was doing it mostly to tell myself that, even if no progress was there, I'd keep doing it anyway. About two weeks ago, in the middle of the exercise, to my amazement, I realized that what had been some time ago absolutely impossible, now I was able to do - the range of movement (especially in arms) has improved, plus, this nagging pain in my neck I couldn't get rid of has gone down by 70%.
It's really worth trying. It takes lots of time and patience. Also, one must be careful to not tax the system. The good news is that it may help anyone - no matter what age, time spent on drugs, etc. It surely helps you from the psychological point of view as well - you know there *is* a progress.