only 6. I was surprised.

here's what Pat Miletich said:

"I have no idea what to think any more. I spent 17 years fighting professionally, and obviously as you get older, you lose a step and your test levels go down, but the amount of knowledge you gain over that time, there's a lot of knowledge. If I'm able to get my levels back up to when I was 21 or 22 years old, awesome. Then I've regained some of that strength and aggression back, and I have all that knowledge over the young guys. It could help a lot, but, in the end, it comes down to this. If you fight too long, no matter what, you're going to end up having physical problems.

"A lot of these guys that are doing that, extending their career longer than it would normally be possible, I fear for them with some of the damage that is going to be done to their bodies. Sure, they might be stronger than normal now, but in the end, it comes down to how these guys are going to be 20 years from now. Are they still going to be able to spell their name?" - Pat Miletich via BloodyElbow
answer's in the link for cheaters*

*see what i did there?