Re-entering National Guard Questions

Hello,

I left the National Guard after 13 years of service as a Staff Sgt. I'm wondering if there is a certain amount of time that passes before I both lose access to NCO (E-5 or E-6), or the traditional retirement system? And what are the age cut offs for both rejoining enlisted, or doing something like a chaplaincy program?

I would consider rejoining once my business (which took off) slows down or becomes more manageable, or once my five kids are older. I had to put service on hold as things got busy for great reasons!

I'd also be curious if anyone has any real experience of either going back in, or deciding to stay out after getting close to 20 years, primarily due to your self employment or business taking off. I am making upwards of $300k a year now which has been life changing and a blessing, but after leaving the Guard I realized it wasn't just the money. Part of it was the feeling of doing something nobody else gets to do, and the other part was the medical benefits! Which are amazing compared to open market.