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No. Having air brakes is not a determining factor as to whether you are required to have a CDL (refer to first answer in this section). (��383.5 and 383.95)
The driver must be at least 21 years old to operate an interstate commercial motor vehicle. (�391.11)
No. A CDL is only required when driving vehicles with a gross vehicle weight rating of 26,001 or more pounds; any combined gross vehicle weight rating (2 units) 26,001 or more pounds; any vehicle that is required to be placarded, or carriers of 16 or more passengers including the driver. (�383.5)