I did the tour wth the criuse add on in Setember 2013. It is an amazing trip. You will have great time. If you ask, Julia can tell you the age range of your fellow travellers. I was a few years older than you are when I went. More imortant than age is fitness. There is a fair bit of walking, and lots of steep steps to negotiate, especially on the great wall. I had no trouble,, but several less fit and overweight people half my age struggled!
. Ages on my trip ranged from late thirties to late seventies, but the group gelled very well.