They're not, at least not my serv : S13 - Shino.

The server is dying, and has been dying for months now, and we have yet to get merged even though it's been requested several times since January IIRC.
Just played the 1st round of GNW (I'm in the 3rd most powerful group, out of 4 groups eligible for GNW), and we got blasted because the only people that keep playing are the ones who spent thousands, and some of them keep doing so even though it's obvious the serv is almost dead.

We barely are able to do Sage. And GNW is practically an auto win for the top group, simply based on the number of people available for war.
We used to have the 6 fields with at least 3 players, sometimes we got to 4 fields with 6 people. Tonight, we had 2 fields with one person, and the other were duos.

So, no, the oldest servs aren't necessarily in a better place.