I'm 33 never heard of that. Then again if it wasn't taught in auto mechanics I wasn't listening.
I'm 30-something and did it. But I am a bona fide grammar nazi if ever one existed (without the compulsion to correct others, thankfully). I notice split infinitives, sentences ended with a preposition, dangling participles, the plural pronoun incorrectly paired with the singular antecedent (using "their" when it should be "his" or "her" as in "No one should be deprived of their rights."). Yep, that's me.