I just thought "wait a minute, Tara can't be 40 yet, I'm sure she's only a couple of years older than me." Then I remembered I'm 38.
Ha, I have had the same experience! In the run up to Seth Meyers taking over Late Night, I read something that referred to him as 40, and was like, "HE'S WHAT?! Wait, you're going to be 40."