Thoughtscream's crew ranges from 21 to nearly-30. Personality and chemistry matters more than an arbitrary age range, I think - though I suppose my statement's weakened by the fact that we are still all in our 20s.I can't see where in that sentence you said that the age range was narrow IYO. Was it in another comment?
Yes, I'd agree group chemistry matters more than a specific age range, but you appeared to be saying "look this group has people all the way from 21 to 30 years, this huge range shows that personality and chemistry ...". Group chemistry I suspect is highly dependent on age and background and specific circumstances of the group.