I actually think my training gets better the older I get because I have to train smarter.
My technique also gets better because I don't have the strength to force it any more.
Still aging and still improving.
This also is my experience. Injuries and body changes forced me to completely reevaluate the way how I practice. Because of those changes, I'm still improving my flexibility, health, quality of the techniques and general understanding of the practice. I can do decent cardio training, without too much physical effort. Also receiving powerful techniques became very easy; I think it was the biggest surprise. I was convinced that with age it would be impossible.