Hello Patricia123
Welcome to the community. We were all nervous to start with and yes, we had to take that first timid step into the great unknown. However, once you have taken that first nervous step you wonder why you ever worried in the first place.
Ages can range from 30ish up into the eighties. Do not worry about this as at the end of the day it is only a number. Women usually outnumber the men. Whatever the makeup of the group they really gel well together, after all, everyone wants the same thing and that is a good holiday.
Remember that it is your holiday, and if you do not want to do something, just tell your Tour Manager and go your own way. I have 2 holidays booked in 2012, one to Andalucia and the other is to China with the Yangtze add on. I am 72 and you can rest assured that I would not be going with a company that I didn't trust.
Finally, the choice is yours, find a holiday that you like the look of and go and book it. You certainly will not regret it.
Best wishes
Peter