Tell me, tell me, tell me, come on tell me the answer
You may be a lover but you ain't no dinosaur

The story:

I realized how wrong I was after leafing through a Beatles lyric book. I'd always thought it was a bit strange, but, hey, it was the Beatles...Thought maybe it was their way of complimenting her, you know, she's not too old (dinosaur) to ride on the slide!