Mark,
Other than my Christmas hol mentioned above I've so far done 4 other holidays with JY (2 America & 2 european) and they have all been good. Got two more this year (this month and october), really enjoy these group holidays.
I'm 54 (my first trip was 52) and the age range is a spread of both younger and older althou, gh usually higher percentage older.
Just go for the holiday you fancy, you wont be dissapointed, they are all well planned.
Mick