I think he was being sarcastic. I'm nearing 45 and wouldn't want to be 25 again for the world.
I'm closer to 45 than 25 these days and couldn't agree more. Took years to build up the experience I thought I had at 25, still a lot more to learn, wouldn't trade it for the world.
This is such a horrible misconception that I think you've never worked with senior people in your life.