It certainly doesn't seem to be an 'equal' age difference between the guy and the cougars and the guy and the 'kittens'. The guy is what...30? The kittens are all in their 20's...many 25 or older...that makes a 5 year or less difference in age.
Consider that the youngest of the cougars at 40 ...there would still be a 10 year age difference.
Would have made more sense for the guy to be mid-30's to really be a test of age.
My guess is that he chooses a kitten. From my perspective, Amanda is the only one left in the entire lot..that would make sense for him to choose.