Add the ability to specify age ranges for adults as well as children#133

We would like the ability to specify an age range for adult sessions, rather than just saying age 18+, in the same way that you can for children. This flagged as an issue this week, as we wanted to advertise a session as being for ages 16 to 29, but if we put it as an adult session, it defaulted to 18+, and if we put that it was adults and children, it showed as 16-18+, which looks odd. In order to put the correct age range, we had to put it as a session for children.

Hello Active Hastings - this has been possible for a while now but we forgot to notify you via this request board. I hope you found the feature!