Hi, Misa!
Kindred is definitely somewhere in the middle of what you've experienced. Most of us have been around since the early days of 1.0 (even some of us were 1.0 beta testers), and have followed the game in one way or another. But we're not a high-level linkshell. Some of us have high level and even level 50 classes but there are also those, like myself, who wanted to leave things to do when ARR went live so I concentrated on crafting and left my combat classes largely untouched. We also have new players who have been waiting for the PS3 version, so they're just now getting into the action. You'll definitely have things to do and people to play with fresh out of the gate, but we're an established linkshell and love to help new players.
See you in Eorzea soon!