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If behaving in a certain way makes you feel good or adds to your enjoyment of life, why should it have to be toned down? So other people feel more "comfortable"? So you don't look "ridiculous"? Phooey. Don't listen to such mean-minded nonsense.
And what are we supposed to rein in or do away with anyway?
Mature adults, it seems, should have "normal" hobbies i.e. ones that other people can understand, like gardening or knitting. No eccentric interests like collecting pepper grinders or making the Taj Mahal out of matchsticks.
You should never be too enthusiastic or gushing about anything, as it's "childish". Your appreciation should always be restrained and thoughtful, suggesting some subtle dimension of pleasure (whatever that might be).
You shouldn't wear clothes that are too flamboyant or eye-catching. No bright colours, no miniskirts, no budgie-smugglers, nothing too tight or too scanty. You should blend in with your surroundings and dress "modestly".
You should always be polite and inoffensive. Keep a lid on those controversial opinions about Bible-bashers or baby-boomers or drunken louts. Maintain a neutral atmosphere, however artificial and strained.
But why should we always suppress our natural tastes and responses in the name of being "mature"? Which means what exactly? Responsible? Sensible? Well-behaved? We can be all those things without turning ourselves into strait-laced old farts.
Maturity? Bah, humbug.