Obtaining any age waiver for a course such as the Army's Basic Airborne Course is dependent on meeting all the fitness and physical (medical) examination prerequisites.
The older applicants having age concerns will better serve themselves by reading the enlisted or officer classification description for the AFSC or AFSC of interest. It does not matter if going the Air National Guard, AF Reserves, or Regular (active duty) Air Force route as the entry classification requirements are the same for all and more importantly the duties and responsibilities info informs what is expected once trained and qualified regardless of component and unit of assignment. The AFSC classification descriptions are found here http://specialtactics.com/forums/ubbthreads.php/forums/6/1/Enlisted_and_Officer_Classific.html
I suggest also reading the initial physiology training info found at http://specialtactics.com/forums/ubbthreads.php/forums/53/1/Initial_Physiological_Training.html
The three posts (High Altitude Mountaineering physiology, Diving physiology, MFF (high Altitude) Parachutist physiology) give insight as to why functional wellbeing of body organs, muscles, and bones is as important as fitness ability to run, swim, and do calisthenics. The context being exercising, fitness tests (PAST) are not doing core skills to accomplish or do something in the operational environment.
The disconnect of physical fitness standards (PAST) of being reliable indicator of being able to do is the complete lack of the testing criteria being connected to adapting or coping quickly to do in a physiological and psychologically stressing environment.
A young inexperienced rookie has better adaptability than the older than 30 years old inexperienced rookie. Older age gives an edge only if it's connected to years of operational experience. A person "entry" classifying into one of the Battlefield Airman AFSCs has no experience. This to a lesser degree applies to prior service too as no Army or Marine MOS or Navy NEC converts as being equivalent with needed experience and training.
The Air Force's perspective of providing AFSC awarding training is the completion of such training is expected to put a trained and qualified person into a line unit as an "available" and "reliable" operational capability to be utilized to accomplish missions.
A trained and qualified battlefield airman in being an operational capability has no shelf-life (can remain not used in storage) but rather has a service life (the acceptable period of use in-service). Such attributes are more appropriately defined as individual readiness and unit readiness to do at a moment’s notice.
The human performance acceptable period of being in-service to be doing something is broken down in terms of period of entry enlistment and career airman enlistments. Regardless both have ready to deploy/employ availability, reliability, dependability, and survivability expectations pertinent to service-life. When the Air Force entry classifies an individual into an AFSC the expectation is the individual will be assigned to a unit to do what it spent all the time and money on the individual to be there doing what the individual was trained and qualified to do. This is where and why age for entry classification purposes becomes a waiver concern.