Only you know the reason why. It should be quite easy to figure out though.
When you are with these guys, how does it make you feel? Or another way of thinking is what's wrong with a younger, shaved, unmuscular guy.
For me, I love being sexually submissive. Submission is exilerating and freeing one's self of being in control. So I tend to go for guys who are taller, more muscular, aggressive/dominant and hung. It's not really necessary but it makes the role play easier like any other form of type casting.
For some, age plays into this dominant role fantasy. Perhaps you are someone who enjoys being submissive too.