Alright buddy here's some facts: Bonnar's 4 losses are to Forrest Griffin x2, Lyoto Machida, and Rashad Evans, all of which are now ranked as top 5 LHW's. He is a BJJ black belt under the late Carlson Gracie, and competed as a Golden Gloves boxing champion. All of his losses have come by decision, 2 of which were extremely close (Forrest I, and Rashad) with the exception of his loss to Machida which came by way of a cut.
Jon Jones on the other hand has been training MMA for about a year. While he has looked impressive thus far he hasn't beaten anyone remotely near top 10 status. Bonnar being 31 years old is not "over the hill" as you have been saying, and he'll show it tonight.