Back then, whether you were a famous actress or a young girl in a relatively small town, it was not only not so out of the ordinary for older people to party with and come on to younger girls (and I imagine boys as well), but also a LOT easier for them to do so without repercussions from the kind of media we have now and with the education that young kids get regarding these situations.
I know that there were not just 1 or 2, but MANY men aged 20 - 40 who willingly bought alcohol for or drank alcohol with, smoked pot with/sold pot to, sold cocaine to/offered free cocaine to me and/or my friends when we were between 12 and 16 years old.
Those things, alcohol/drugs, sometimes led to those men also flirting with, coming on to, feeling up (breasts and more), attempting to have sex with and, in some cases, succeeding in having sex with girls who were anywhere from 10 to almost 30 years younger than them.
And most of the time none of those girls told any parent or adult with the authority to do anything about it, for fear of getting in trouble themselves, social repercussions, or the fact that many times if they did, it was brushed off, blamed on themselves, or swept under the rug.