With the amount of random attention from men women get, the rate doesn't have to be very high for it to be regular, particularly when you add selection bias that people who react like that are probably more likely to approach someone in the first place.
And while I would agree it's probably higher than 1%, 1% really sounds lower than it is - that would be 40 million people globally. If it's 5% it's 200 million and there are still almost 4 billion that are completely normal.
The sad reality is that it just doesn't take high numbers for that kind of experience to be a regular occurence.
Is it that surprising? Age play is a thing, plus so much porn has actresses dressed up to look like a child for some reason (the reason is people are into it). It's just that, same as any other fetish that will harm people if acted on, 99% of that 1.5% are just gonna be normal about it and not diddle kids.