[header] How to join the air force quickly [title] Meet age requirements. [step] To join the air force for the first time, you must be at least 18, and able to be enrolled in basic military training before your 28th birthday. If you plan to apply for officer training school, you must be able to be commissioned before your 35th birthday. 
If you want to apply to be a physician, nurse or allied health, you must be in commissioned officer training before your 40th birthday. [substeps] If you are already in the military, these age requirements may vary.