My wife and I have been keen walkers for many years and have walked regularly - particularly in the Granada & Sierra Nevadas in Spain and Madeira along the levadas.
I have been retired now for 25 years and at 82 have had to slow down somewhat. But we still walked in Scotland and in Wales.
Recently though I started to suffer from arthritis in my knee and for a while could not walk at all. I am getting used to and despite the pain we have started to walk locally again. But long walks are out.
We both use Echo boots and walking sandals and had no problems.