[Nogrod]

More seriously though...

Think of a 12 year old dating with a 6 year old (six years difference)... A problem indeed.

Think of a 20 year old dating with a 14 year old (the same six years)... Well a problem still.

Think of a 36 year old dating with a 30 year old (six years again)... Now where has the problem gone?

And it is not uncommon that people date with others twenty years younger / older than themselves - after both parties have reached a certain adulthood. And those relations can be satisfying to them both.

Now the question that is begging itself is that will thousands of years of a life-span make a difference in comparison to a few hundred years? With us humans the differences start to vanish quite soon as we become "adults" but then again the common upper limit is only around 80.

I'd say the perspective of someone living for a few thousand years could change the "maturity" of a person enough to make a relationship with someone who only lives a few hundred years possibly problematic, but I think it's not an easy question.