Hell no. My best tested FTP was 365 which was 4.8w/kg and that was when I was 45. I started cycling at 35, training with a coach that knew what he was doing at 42 as opposed to clowns that called themselves coaches. No way in hell I could ever get back to that kind of power. The intervals I do these days are well below my 'easy' week levels that I did when I was fast.