He’s probably in his early 20’s, but already veteran of many battles (though he just barely survived some of them, by the look of it).
He carries an arquebus, sword and pistol, standard weapons for any respectable guerrilla fighter.
While these Ajshar rebels are mainly fighting to defend their lands from human occupation, not all human countries took the same approach towards the native catfolk. Rather than ruling with an iron fist, some human governments opted for compromises, peace treaties and mutual support. It’s very common for these rebel groups to be allies with one human kingdom against another one, and receive resources, lands and privileges in echange. “The enemy of my enemy” and all that.
Many of these cats would totally be fine hanging with humans, as long as they are the “right ones”.