If you think everything tops out at 5-7 years you are no where near correct. 5-7 years developers are still juniors who have spent time down one path and know it really well. So well that they become opinionated that this is the best way. You don't turn into a senior until your wiped that mindset away. Until you become un-opinionated you are still a junior. At 7 years I knew it alL, it took awhile to reach a point where I know nothing but I am open to all opinions and ways to do something. Once you know it all work back to an open mindset