Are age gaps bad?Watch
But yeah women his age are totally going to be judging him. Guys too
Soon enough the age of consent will be 27 and an age gap of over five years will automatically qualify you for the Chris Hansen wagon. That's the way this silliness is going.
I personally don't there is any problem with it morally or ethically. If you both are happy in life with it that way why not. What other people think doesn't matter, it's your life you've got to live not live your life by their values. There can be many people around with outdated views such as above of guys in their forties not wanting kids and be somewhat retiring. For the majority of guys in their forties that's not the case at all.
To be honest as a guy around the same age as the guy you mention women around my age don't really do it for me. I wouldn't necessarily go looking for an 18 year old as there can be generational differences but if the right girl came along then those generational differences may not matter they might even add to interest. I think certainly from the perspective of an older guy being with a girl who has a lot of energy could be quite thrilling.
The thing that people have more difficulty rationalising is why a man his age would decide to be in a relationship with a girl your age. You mention attraction, but being attracted to someone and wanting to be in a relationship with them are two different things. I am quite a bit older than you and younger than him, and whilst I can acknowledge that girls your age are attractive, I cannot imagine myself choosing to be in a relationship with an 18 year old. I think a lot of older guys (and women) would take the same view, and whilst I understand the point Gavin2016 is making I don't think it's largely a generational gap issue. It's more your respective progress in life and the position you'll be in. At the age of 18 you have very little life experience and still have some way to go before you even know who you are. Experiences that you will gain in the next 7 years or so, including university, travelling, starting a career and so on, will dramatically shape who you are and could potentially set you on a number of different paths in terms of where your life goes from there. Whilst you will eventually likely want to start a family, you're unlikely to either want to do that now or be ready for it. Equally whilst you will likely have plenty of friends now, your friendship groups and support networks will change and evolve significantly over the next ten years or so, as will your interests. The period you're entering now is an exciting but volatile one. A lot will change in your life, and that should as exciting as it is daunting.
By contrast, at my age I have been through that, and a 42 year old certainly has. I'm in an established career, and have established relationships with people around me. Whilst I can always gain new experiences and interests, I very much know who I am and am settled in my life in general. Not all 42 year olds will be in settled careers, but they will all benefit from a vast amount of life experience and will broadly know who they are and what they want. That in turn makes it difficult to understand why they would seek a relationship with someone who is in a vastly different position in terms of life and maturity than them. In many ways it's not the age gap but the life gap that makes the difference. And because people cannot understand his rationale here, the conclusion becomes that the reason comes down to him exerting power and influence over you, something that men his age can do very easily with girls your age.
Now, does that mean that that all holds true here? No. I am sure there are relationships between two people around your respective ages that have been happy, healthy and have lasted. You may well be in one of those. The situation is broadly unusual though, and I would suggest is more likely to fail than it is to succeed. I realise you could say that about any relationship statistically, but relationships like this even more so for the reasons I've stated above. The reasons I've stated above are also the reasons, to your question, why people will judge him and not you. Whether that judgment is warranted in this case is something that I cannot know because I don't know you are him, but it is nevertheless the answer you're looking for.
From my experience as someone who has been with a man who was only 7 years older than me, I would highly advise against it. I'm not trying to generalise, but older men tend to be extremely manipulative towards younger females. Also, just because you're LEGALLY an adult, I still don't see you as any less of a child than compared to someone who is 16 or 15. Bottom line is, it's kind of creepy and borderline pedophilic that a 42-year-old man is with an 18-year-old. Please just take that as a caveat.
You're old enough to make your decisions. It doesn't matter what we think.
Just know that the relationship is incredibly likely not going to last. Be a bit wary because the further away your age, the less likely the intentions are for something serious or real.
He may just want you physically because he likes much younger women... even though he comes across as kind and nice, he may just be a bit manipulative to get what he wants, which is sex with a young woman. Some guys would go to great lengths for that.
If you are ok with all that though then all I have to say I guess is have fun together while it lasts.