Hello Matt,
I think this is already a social group that meets in inner city Melbourne.
Our numbers are already quite low without your strange age restrictions.
Why would your own age be the upper limit?
What are you going to do after your next birthday, just drop out?

A film sounds good, we haven't done that before.
Why don't you just suggest a date/time/place/activity for a meet and ask
people to respond here if they intend being a part of it?

That's how it has worked to this point (although John is the one who has
made the dates, etc).

--
Peter