If you have a female in her thirties, you will get men in their 30's 40's and 50's. Keep an eye on your family tree though, as you don't want to accidentally marry off your 14 year to a 55 year old, but you might want to marry that 45 year old off to the same. As for the traits, I think that they are just randomly generated, and depending upon how desperate you are you might wait for the right guy, or just settle for someone who you can get a thirty year career out of...