I believe her 100% because when I was that age (in my 20s,) in fact from 16-17 to about 35, I regularly had older men hitting on me, sometimes with their wives in fairly close vicinity. When I was 17 I had a man (who was with his wife) in the shopping centre I was walking in, say to me 'God you're fucking gorgeous you are!' I was slim and young and blonde and was wearing a t-shirt and short skirt (3-4" above the knee.) I was so shocked. His wife looked so embarrassed, and mouthed 'sorry' to me! I thought 'that poor woman!' 
There are dozens more examples I could give, and I imagine most women on Mumsnet could come up with a few too...
One more example.
A manager at a corporate job I had in the 1990s (when I was in my mid to late 20s, and young, blonde,and attractive,) tried it on with me from the day I started there. He had tried it on with other women prior to me, and was a total letch and an utter creep. Always finding a reason to touch me, grope me, and kept winking at me.... I did mention it to a couple of people, but just got told, 'oh that's just creepy Mike. Ignore him!'
I told someone superior to him and got told 'it's your word against his.'
He actually followed me outside one day when I went for a 5 minute break to get some fresh air, and he chatted 'normally' for 2 minutes or so, then he asked me outright if I wanted to have an affair with him. He said no-one needs to know. I said 'I'm married, and so are you!' He said 'that's what makes it more fun!'
I said 'you can fuck off I don't even fancy you' and stormed off back inside.
From that day he made my life so uncomfortable and awkward for me at that workplace, spreading lies and rumours about me, and deliberately sabotaging my work to get me in the shit. So I left. Found another job. I had been there 2 weeks short of one year.
6-8 months later I met my replacement who had started 2 weeks after I left. Also an attractive young 20-something blonde. Said he was doing exactly the same to her. Constantly leching and groping, and had asked her if she wanted to sleep with him. She was so shocked she had said nothing, and had just run off. Since then he had been carrying on winking at her, touching her, and groping her. She also mentioned it to someone in HR and they said (again!) it's her word against his! Basically all these girls/young women were complaining about this cunt, and nothing was being done.
tl;dr He got away with it with a number of women, and it makes me so mad that they didn't do anything about it. Problem is I had had men getting a bit gropy/lecherous as a teen in my first job - always old enough to be my dad or grandad! And I did tell my boss about it, a couple of times, in different jobs. And I wasn't believed. In fact I was accused of leading them on because of how I looked. Excuse me for having blonde hair, big boobs, decent legs, and wearing nice clothes that accentuated my figure. Should I have come to work dressed in a fucking sackcloth, and a handmaids style bonnet?!