When does "old" start?

I used to say that middle age lasts until dirt is thrown on you. I became 69 two weeks ago. Am I (GASP) already an alte kocker? (That's Yiddish for "old shitter.") I prefer something like "esteemed, learned kvetcher."  (To kvetch is to complain.) I do a lot of that.

I've kvetched for my whole life. My mother said that I once cried in my high chair until she realized that I was upset because a kitchen cabinet door was left open. I could not speak yet, but I could kvetch.

I've always had very high standards, that often do not apply to me. My wife often kvetches about my lapses. She thinks I should shower every day. That's ridiculous. I have aroma, not stench.

The Internet makes it easy to kvetch to a large audience. I have dozens of blogs, websites and Facebook pages and I tweet sometimes. My books are filled with kvetching, mostly funny kvetching.

When does alte-kockering begin? Maybe 75 or 80?

Is there a Yiddish term for "pre-alte kocker?"

Photo from http://www.elephantjournal.com Thanks.