to exist or happen at an earlier time than (something or someone)
verb
http://www.merriam-webster.com/dictionary/predate
“As for the ”Natural Woman” Christmas or the ”You’ve Got a Friend” Christmas – these predate my consciousness. But they must have existed, what with Ben being a September baby and me October. Those were the sexy Noels, delivering babies like presents nine months later.”
I still don’t really understand what this passage means.