There's always that small population of young women who have a strong preference for relatively old[er] men, though.

Not in the pornographic movies or those gold-digging women you often see in media.

IMO, the youngest girl I'd date would be five years younger than me, but that number won't be at 5 just yet until I hit my 30's or so. It would be extremely nice if we both had the opportunity to retire close to the same time where she and I can spend the rest of our last days with each other.

Ideally.