The Playmate System of measuring age

I suspect that most males born before the late 1970s (who would remember when magazines were popular and when Playboy was a significant print icon) either use or would understand this measurement system. Mind you, I haven't read a print copy in years (literally - I think the last time I bought one was in the early '90s) so I don't have that much actual biographical info to go by other than what's on Wikipedia but I have a way of measuring my relative age by the average age of Playboy Playmates (according to Google this is about 21-22):

You're a kid when: Playmates are old enough to be your babysitter.

You're a young adult when: Playmates are old enough to be in school with you.

You've peaked when: Playmates are your age.

You're getting older when: Playmates are the age of your kid sister (assuming you have one).

You're middle aged when: Playmates were born around the year you met your spouse (That's where I am right now)

You're old when: Playmates are the age to be your kid's babysitter.

It's all over when: Playmates are younger than your kid.

I think this could be developed further, but I really don't have a browser suitable for doing the research...