So far I've been paired with at least 1 new person and no other mentor. I always just toss out a greeting and say that if anyone has questions, they just should ask. The multiple 60s people usually say "I'm good" and those who are truly new do tend to ask if there's something to watch out for (which I usually just give them the most important thing for their role).
That said I did join as tank so far cause that's what DF needs most of the time and I always got different content. (Ifrit story, Vault, Research Facility, Copperbell story, Anti-Tower)