This would only be valid for new-borns, since the implication is that no experience you had before year x, x being a number arbitrarily agreed on a couple thousand years ago by humans, exists. Which could potentially be great trauma-wise, but not really in any other sense.
All those decades of experience (and skills, and trauma..) are vital since they inform and shape the opportunities you not only have access to, but how you can or can't deal with them if you do.