I'm a new member too and have been looking at the site for a while now. Really scared about taking the plunge and booking something and this is my first post.
The "age" thing is a concern for me too. It's not that age in itself is a worry, and I don't want to sound ageist. I suppose I just need reassurance that there will be people broadly around my age on a JY holiday (by broadly I think I mean 10/15 years either side).
I'm 46 and would be worried if I booked and everyone else was either under 25, or over 70.
This is all really new to me. Been on my own for nearly three years and would like to holiday again (Have been looking at Monet's garden/Paris by coach) :s