I've gotten much worse about that over the years. I used to almost never have typos or grammatical errors in my writing, starting... I dunno, at age 10? Really young, anyway. If I made a mistake I'd catch it instantly and fix it without missing a beat. Some time in my 30s I started to get worse. My main problem seems to be simply skipping entire words, but I'm also far worse at catching word or phrase re-use without a separate edit pass.