Does crankiness have an age restriction?

I was greeted (confronted) by a reader of my blog last night in person who called me a "C.I.T."

Curmudgeon In Training.
Of course, I was insulted. I thought I was a FULL-FLEDGED curmudgeon!
"You're not old enough," he explained.
So I ask y'all: How old must one be to be an official curmudgeon? Isn't it a state of mind?
[image error][image error]