Eddie
I agree with what Lesley and Jonah have said. I have travelled near and far, with older and younger (I am now 57) and started useing JY in 2006. You all pick a tour for a reason so you have that in common with the other travellers, I totally agree age is just a number, I have had great conversations with much older people, and I have been out walked by many older people.
So give it a go if you don't like it don't do it again?
You can always ask in the editors boards on here the age range how many M/F ratio etc if that help
Cindy