Forget about what people on OKCupid say, what people say online to make themselves look "cooler" rarely has any actually relationship to what they'd do if they had the chance in real life. I went to grad school at 31 and most of my classmates were years younger than I was. And the truth is that most of them are completely creeped out at the prospect of dating a guy who was alive when JFK was alive. I am in the same boat as you with the same age difference. Older women, because of their confidence and experience, also make better lovers.
You are not taking his life away.
Why Would a Younger Woman Want to Date a Much Older Man?
Took 2 yrs to feel ready to date and getting sooo much attention!! Think back to when you were that age. Recoils in horror.