For me, the gaps were 9, 8, and 4. (My brother is twelve years older than I am.)

Personal knowledge bases are unpredictable. Pitney was a more clean-cut type than the Doors, or even the Beatles; think Ricky Nelson - if you remember him. (Son of Ozzy and Harriet?) Oddly, it turns out that he and Mick Jagger were good friends....