Yes,
that was my ex-husband. He kept dating and hanging out with the same age people as when we were in our 20's and together. We aged but his companions didn't. It is a maturity issue but also its that young people expect less out of you because they haven't figured out their life yet either.
I worry about this with my son. He's 22 yrs old and i haven't seen much of a maturity change lately while those we know who are his same age seem to be moving ahead.
Sigh!