Being a senior engineer doesn't really have anything to do with how long you've been developing. I've met amazing 21 year old developers who can out code people doing this for 20+ years in their sleep. I would say one of the reasons "seniors" are so much better with AI is because they have CS fundamentals. They know what to ask, they know systems design, they know what ACID is, they understand race conditions...
AI + CS allows you to develop with leverage I've never seen before.