I'm part of a Free Company with multiple players over the age of 30. With the average age range of mind to late 20s. However we are on the smaller side boasting just over 20 active members. Meaning that the 4-5 of us who are could be classed as about quarter of the FC. We're on Omega, are a social community and active daily.

If you're looking for an exclusively higher bracket, then perhaps you would do better searching on the Legacy Server. This would mean that the elder players of that server have most likely been playing from 1.+ thus having a higher concentration of those players.So anyone in their mid 20's at the time who started then would now be within the bracket you seek.