I think we may be confusing "birthday" and birthdate."
If they shared the same birthday, they'd be the same age, but in this case FloydianGP's birthdate is the same as Richard Wright's.
I make the comparison, rather than conversely, in this way because I assume Rick is older than FloydianGP, and thus had his birthday

before FloydianGP's.
Confused? You will be.
