I was in a significant age gap relationship for 4 years and even though the guy was great, I couldn't get over the age difference. (19 years)
Let's presume you eventually decide to marry this guy. When he's in his 60's you will only be 44. Would you be prepared to be possibly widowed at that age and have to either start all over again to find someone again? Or be without a husband for the rest of your life? I'm not saying this scenario is a given, but it certainly a possibility. Dating again at middle age is not horrible, but it's not something I wanted to willingly sign myself up for.
It's not crazy to date someone that much older than you, nor is it perverted. But chances are, you will always be in different life stages (physical, emotional, situational) during your relationship and this difference will cause issues not present in age-appropriate (for lack of a better word) relationships. Is it doable? Sure. But it is work.
My best advice to you would be to not take this lightly. Age is not just a number. Think about what you ultimately want for yourself and your future. I'm willing to bet a much older man wasn't on your list.
“Inside every cynical person, there is a disappointed idealist”--George Carlin