If not what are there requirements. As for the requirements of being hired, I'm not really sure, however Barton or one of the contractors could tell you. I'm not sure what the hiring requirements actually are, but all of the contract controllers I've had contact with have prior experience. Usually, they are retired military or FAA controllers working part-time.
Training is handled exclusively at each contract facility.
The way that I understand the program is as follows. The contract towers are run by private companies that have won a bid from the federal government, other NFCT's are run by the local governments. Those entities determine the qualifications to be hired for the job. The FAA probably has some kind of minimum and maximum age limits, however I do not know if or, what they are. I do not know if there is any minimum amount of training required before a prospective controller takes either the CTO or the live traffic evaluation.