With the amount of scambots, trolls and what have you going around, it would be nice for an added measure of protection by being able to set an "age" limit on our groups so that avatars of a certain time online can not join and lock out all these day old scammers and troll accounts.
I know LL can not control all accounts as they join but this would lock down a major issue and save people grief and from being scammed. While this does not thwart ALL troll/scam attempts when they take over established accounts, it would surely limit the issue by a lot and be less work for everyone. Including in the SLB group as its been very prolific in as of late for an example.