I tend to look at things more in "life stages" than anything else.

You're nearing retirement. Getting involved with someone else who isn't near retirement will create tension - because they'll be working full-time and may start to feel like a care-giver, even if you get a good pension. You'd be at home, doing what you want, while they'll be working. Now... if the other person is also nearing retirement or just retired, then it'd be totally cool.

The specific age in that regard? Wouldn't really matter, because you'd be entering the same stage of life as each other.

That said - when I was 27 I was being hit on by a guy. When I found out he was 19, I was like "ummm no". Not that an 8 year difference bothers me - I'd date someone who was 34 at that point. The reason why was because he was just freshly starting university, whereas I had already established my career. It's two different life stages. At 27 someone at 34 was fine to me, because we'd both be in earlier stages of our careers.

When I was in highschool, I wouldn't have gotten involved with someone in university or working full-time for the same reason. While in university I wouldn't have gotten involved with someone who was established in a career. Because the life-stages aren't equal.