I really wasn't speaking of a group of related people. It's more like say a 60 year old woman has a certain interest and she joins a group about that interest, and nearly everyone else in the group is around thirty years younger than herself. She hopes to be seen as just one of the group, fitting in like everyone else. Though some members think of her as and say she's "like the mom of the group," and perhaps even give her the nickname of "Mom," solely due to the age difference. Being a mom is wonderful, but in this instance, it has the dynamic of the younger-aged people are cliquing together, while the older lady is made to feel like more as everyone's chaperone.
My point is if you find yourself put into a group (for school, activities, sports, etc.) of mostly your own age while there may be one or two a generation older or younger, treat everyone the same. Don't presume older people in the group are going want to be bossy, or nurturing, or only there to supervise, etc., and younger ones are needing to be bossed, or disciplined, etc.