I remember, in the late 60s, being shocked to discover that there were pop stars younger than me. I was only in my late teens!
JP - it depends what you mean by "much older" - it's not exactly a precise term.
My dad wasn't older than the pm until 1979, although it was a close thing with Wilson and Heath, both of whom were born, like him, in 1916, heath only a fortnight or so before him.