Can you go to OCS if you've been in longer than six years?

While I am not an expert on the rules surrounding OCS entry, I can say that I attended OCS with E-6s and 7s and we all went on to commission at 2LTs. I was prior service but then again I had less than 6 years service. Unless they hustled their promotions I would say most if not all in that grade had been in longer than 6 years. Perhaps things have changed but keep pushing because they're always going to tell you 'no' right off the bat.

If that's the case, it's new. Usually the OCS programs preferred prior service members that had over 6 years, meaning they were likely experienced NCOs or at minimum had either their Associates or Bachelor degrees. I switched over after being in for over 12 years.

I dealt with this myself. I was trying to go to Federal OCS in the Regular Army. I was denied due to having more than 6 years of active duty time. I ended up going to the National Guard with the hopes of transferring to the Regular Army. I was able to go to OCS with the National Guard but it was not the Federal OCS at Benning. The Guard runs their own OCS programs. But the recruiting policies, aka Business Rules, change often. It all depends on the needs of the Army. I would do everything you can to get to OCS before you hit the six year mark to be safe.