Hi - well I thought I had above average fitness and I still found it tough but that was the dealing with the altitude sickness! I was the oldest in my group (47) but there were other older people on the trail (and embarrassingly much fitter than me!). I would definitely recommend it, it's just stunning, but go in season when you're not facing the cold and get some hiking experience in first. It will just make it more enjoyable - age is just number :-)