act one's age, be mature and not childish, feel one's age, realize that (you are) growing old, I wasn't born yesterday, not stupid enough to believe anything said to you, in this day and age, in the present, over the hill, too old to perform as well as before., you can't teach an old dog new tricks, it is very difficult to change habits, be on the wrong side of 40, 50 etc, be older than ......, getting on, getting old

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