Sally,
Welcome to you I am sure if you look around the posts on here you will find many answers to questions. Like Andy I have done a fair few tours 7 with and another booked for 2012. Some people enjoy the taster weekends I think they are popular, it would give you an idea perhaps of the sort of age and range of person that's interested.
My first tour was long haul to the states, for me I just picked a holiday I really fancied and went for it, it worked out very well, and I have being useing JY ever since.
Age range 50-70 with younger and older either side of that think the youngest has been 28 and the oldest 90. There are always more ladies to gentlemen in the group smallest group has been about 20 largest was 40. Any other questions please ask away I am sure someone will have an answer for you.
Cindy