For what it's worth: he's the former FreeBSD security officer, so I wouldn't worry too much about which version of FreeBSD he's using.
It isn't that much older... stable/9 was the latest until 10 came out within the last year. The release cycle is closer to, say, Debian, than, say, Fedora.
FreeBSD 10 was just released, January 2014 if I remember correctly.
I've been hearing about it from some FreeBSDers for months before that, so I can never remember the actual release date. But I would believe you on January :).
The release was in January, but a lot of us were running Betas and Release Candidates for about three months prior to that.
JeffR sounded pretty busy with preparing those betas and RCs, iirc. ;)