Age doesn’t matter much, as long as they’re around the same age.
Everything as equal as possible. Similar height, weight, attire.
Ideally, both in pantyhose, shoes off, legs tangled, trading the top position. I also like when the fight goes back and forth between head to head and head to toe.
(I don’t like “real” fights, so a test of strength, submission, or erotic wrestling is my style.)