Do bike frames age like fine wine?

[XXtwindad]

I'm in the process of completing a purchase on a high-end Ti frame, which is about six years old.

I'm wondering if the "mythical" qualities that people laud in titanium frames is the same after six years. Is it enhanced? Does it somehow diminish over time? I have no idea, since I've never owned a high end frame for that long.

What about the "lively" feel of steel? Or the "stiffness" people usually associate with carbon? Do those qualities age well? Do they change over time?

Interested in any feedback from people who've owned the same frame several years...