It changes you for ever, but you are changing for ever anyway.
I, personally, have found reading a continual support to writing.
Every writer has to find their own way into writing.
I don't think I prefer writing for one age group above another. I am just as pleased with a story which I feel works well for very small children as I do with a story for young adults.
Canadians are Americans with no Disneyland.
Of course there are big differences in length and character and vocabulary, but each level has its particular pleasures when it comes to the words one can use and the way one uses them.