I think all core families would be able to run pretty well. I mean, there's was a huge jump from 1st to 2nd gen because some flags and such, but isn't a really slow processor (I would not considered that old despite being a 2010 processor). I have a toshiba qosmio (it's a 1st gen i5) that worked pretty well with 13.0, it's my backup workstation so I didn't upgraded yet.
I think, for a 64bit perspective, even a core2duo would run freebsd 13.1 well (depending on what you use as a graphical interface).