five years younger than "what" she really is

[Mnemon]

A. Marta told her new boyfriend that she was five years younger than she really is.

B. Marta told her new boyfriend that she was five years younger than what she really is.

Are they both correct in your variety of English?

Thanks.

 

[emsr2d2]

You'll hear some native speakers use "what" in such a context but it's not correct.