With absolutely no intention of my own to reach that far down in the age scale, I've recently also ended up, via a sugar dating site, with an 18-year old who intellectually and sexually is far ahead of her age. Almost scary. And yes, I, too, feel like I've struck absolute gold. I think I'm developing a crush on her. She is so awesome.
We dudes have to be mindful though that at that age, people are still much more fragile and vulnerable than later in life, may put on a brave show to gloss over great insecurities, may not completely be clear about right and wrong yet, etc. It is our responsibility to handle with the greatest care and caution. We should put the well-being and safety of the girl way above our own, and when in any doubt, take a step back, chill things and talk them through with the girl, with love.
As a matter of prudence, I have placed control over the pace at which we move forward in our relationship completely in her hands. I've told her that I will never make the first move on anything, although I may verbally suggest or ask things. Once she initiates something I will place my greater experience at her disposal and provide guidance if needed.
Also, absolutely no drugs, of course, and alcohol only in small quantities during our dates. A glass of wine or two, that's it.
I hope I'm not kidding myself here.