Club 18 - 30:
http://www.club18-30.com/faqs
///Age
Q. What are the min and max ages to travel?
A: The minimum age for travel is 17, the maximum age is 35. To be permitted to travel you must be within this age range on the day of departure. There are no exceptions to these rules. If you are under 18 on the day of Departure you will only be permitted to travel if your parent/guardian has signed the booking form in the presence of your travel agent. Under 18's are not permitted to book Online or by telephone.///
This is operated by Thomas Cook
Saga holidays
http://travel.saga.co...-asked-questions.aspx
///2) How old do I need to be to travel with Saga?
The main traveller must be aged 50 or over, however, a travelling companion aged over 40 can accompany you on a Saga holiday.///
as a 37 year old male, I feel discriminated against :-)