I'm not exactly sure what you mean by that. There's really only so much friends can do, Tavern, Aid, trade goods and fp's to GB's is about it really which anyone can do from any age really, aside from BA not being able to give fp's to GB's. Just because someone is a higher age doesn't necessarily mean they will be active and consistent in doing those things. I suppose it's important to know what it is exactly you're looking for then try to find friends that can fulfill that. So if you're looking for active Friends Tavern type people go to global chat and ask for people to add you as a friend that are daily tavern sitters.
Just in case you didn't know you can also view the history of a player's actions with you in the Event Log. Town Hall>News>Event History>Search Name
Then you can see if they are sitting and aiding. This is one of my friends data below, so in the last 6 days he's sat at my tavern and aided me 4 times each.