Hi Paul
Sometimes the information is on the website before the brochure, from memory I think its later this month or early Oct for the new brochure.
The numbers on each tour can very quite a bit sometimes depends on the type of tour, the least I have had has been 20 highest 40-45.
Ladies always out number the men. Age range is 55-70 with younger and older either side. Youngest on a tour I have been on was late (28) twenty's oldest 90ish..
I started travelling with JY 5 years ago I was 48. People of all the ages get on really well I have had some great chats and spent time with much younger than myself and also very much older.
Hope that helps I have don 7 JY tours now with New \zealand booked for 2012.. so if I can help with anything just ask away..
Cindy