Unfortunately, emotional immaturity in males is a factor. At 18, as I have said, I found some of my male peers a lot more predatory because they lacked the emotional maturity for relationships but had a fully working dick. I had far more pressure to do things I didn't want to from them.
I don't have teenage daughters, but knowing what 18 year old lads can be, particularly today with media influences as they are, I don't think I would be more worried about a 25 year old tbh.
You make fair points, but I do think some of the reasoning behind the more common older man,/younger woman relationships of the past wasn't just about male power, but about what was acceptable behaviour for young males. It was often said that women mature more quickly. I don't think that's a biological truth, but I think it was certainly a societal truth in the sense that 'playing the field' was more accepted in men. What that resulted in was women idealising relationships whilst men idealised sex. So the thing about dating an older man was that they'd already done the 'wild oats' bit that men were expected and encouraged to do in their late teens.
For all the sexual revolution for women, certainly when I was 18, there was still the idea that 18 year old boys couldn't be expected to have control over their dicks. Lad culture '(Loaded and FM) was very much to the fore, and for women the answer was not to change that but to match it (Ladette culture).
I wasn't interested in getting pissed and shagging around at 18. I was surrounded by a culture where that was what you did at 18, that was the socially acceptable behaviour. I wouldn't say that's what drove me into the arms of an older man, because I wasn't purposefully looking for an older guy but it might be why we met in the first place and why we got on. He never would have been that sort of guy, and I expect I could have found somebody my age who wasn't, but it would have been harder.