Dude, I'll be watching All Dogs go to Heaven when I'm old and my hair is grey and/or falling out, you're never too old for cartoons. People who say that are just boring conformists who think growing up is about owning a suit, working as white collar slaves every 9 to 5, getting married, buying a house with a white picket fence, and having 2.5 kids to repeat that poor excuse of a life.
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“If you treat an individual as he is, he will remain how he is. But if you treat him as if he were what he ought to be and could be, he will become what he ought to be and could be.” - Johann Wolfgang von Goethe