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Yes.

Quite extensive.

Not for 20 years now. Last time at 29 years of age.

OK, thanks for the honesty. I'll accept the answer of 'extensive' on its face even though it clearly wasn't on the order of 43 years. There is little use in a contest of comparisons though. We've both had some substantial experience and can speak from that.

I will assume that you feel qualified to decide what is good, bad, useful, harmful etc. to you. I feel qualified to make those judgments for myself. I don't feel qualified to decide those things for anyone else though particularly someone I have never met. You seem to think you are. Is that right?