My husband and I did a six-week Dragoman trip from Istanbul to Tashkent in 2008, when we were 57 and 65, and had no problems with it, though we found they camped out not because it was a great spot, but merely to save money. We also had to take turns in cooking, which I resented at times, especially after a long day's travelling, when had to set up tents, prepare meal, clean up etc, finally finishing about 11pm. Dragoman gets quite a few people who are Dragoman "groupies", having done a number of their trips. Some of these people tend to be a bit "unusual" or loners, though it may have just been our trip.
We're about to do another expedition type 8-week trip in Africa with "Nomad", but are staying in accommodation (mainly basic chalets in camping areas), and have a cook on the trip, which is better as allows you more time to do what you want, rather than doing chores.
If you want to find out exactly what happens on a Dragoman trip, you can read our blog on [http://www.travelpod.com/members/diannemurray]
We haven't done an Intrepid trip, though plenty of people our age recommend them.