Well - Remember our guys were 'teen kings' back in the day.
One thing to keep in mind is that attitudes were very different back then so it really wasn't considered that unusual, especially for rock stars, to date very young girls/women. Many people, including my own mother, were married with children by the time they were 18 years old (and some even younger). The majority of marriages back then occurred before the couple were 25. Check out this graph ...
https://www.census.gov/hhes/socdemo/...AA2012figs.pdf