Got called on using this phrase a few times last night at men’s group.

So I decided I’d better see if I’m acting my age (gonna be the big four-oh in Decembre…) or older.

Answers.com has this definition:

A proverb or maxim, as in Mom’s always repeating the old saw, “Haste makes waste.” This term uses saw in the sense of “saying,” and old in the sense of “wise” rather than old-fashioned. [Second half of 1400s]

oh. my. garders!  1400s… I KNOW I’m not that old… but it could just be me ol’ memory fading.  With some degree of panic, and turned to the urban dictionary to see if I’m still down wit dat.

…

phew:

A saying that is an old standby phrase (to the point of being a cliche) but still rings true.

Fo’ shizzle, if dat UB has da werdz in it, I must still be cool…