How do I know his age?

[Bing2007]

Because I know that guy.
He told me his age.
He asked Kevin that he sent him the photos to sign in the mail and Kevin said "I don't do my mail."
Kevin signed different autographs for my friends than the ones that he signed in the mail. Who knows if Kevin's secretary signed for him in the mail.
Some celebrities have secretaries signed for them.

[Reav]

I am seriously confused.