Nicola: I have been on Bos,New England and NYC, Sept last year and just been to Krakow and Tarta Mountains. On the Krakow trip there were 28 of us and ranged from 46-82 ish, try not to think of ages really, you all pick the holiday because you want to go to that Country so you have that in common, its only a couple of weeks maybe of your time at the end of the day.
I must say that both trip I have been on we have all got on so well, and had a real laugh and a very good time...I am going on a JY hol to USA with a lady I meet last year, so you can meet a fellow traveler to go on holidays again with this happens quite a few times I think.
I hope that you book a holiday and that you have a great time.