Does the 39 years old SGT (P) still can apply for OCS with age waiver?

I was 39 when commissioned. I had six years service prior to commissioning. If the age standards are the same you should be good to go with a waiver. Good luck.

Age waiver should be a normal part of your application with regard to your years of enlisted active duty. I also remember reading, many years ago, if one commissioned on active duty with no break in service between enlisted service and commissioning, one could retire at 20-years total active duty without meeting the mandated 10-years commissioned service retirement requirement. Just food for thought.

I commissioned at 40-years old, with age waiver for my enlisted active duty time.

How much time in service do you have?