Huh. I was just looking at someone's birth and death dates, and caught myself in the following succesion of thoughts: "So he was a child during XXX, a teenager when YYY happened, middle-aged for ZZZ, and a grown-up when he died, not having reached old-age." Waitaminute. When did my definition of "grown up" get pushed to age 65? (Actually it was probably a glitched noun-grab by my verbal subsystem when I looked for a phrase that meant "past middle-age but not yet what I think of as old". But I was still startled to catch myself in it. What if I really did constantly change my definition of "grownup" to "significantly older than I am"? I can just see myself at 80, complaining about 70 year olds and referring to them as "kids". But it would be one way to achieve the Peter Pan state of never growing up, right?)