[TenTigers]

Man, some of you read too little, or read too much. Either way, Chin-Na is not a style of Martial Art, it is a catagorizing of technique within an art, which breaks down further into Fun-gun, chaw-guat,bai-hei,dim-yuet,and dim-mak,etc. It contains striking within its methods, and the throwing, grappling, joint manipulation etc is a part of most traditional Martial Arts.
As far as using Chin-Na against a boxer? Of course you can. clinching is part of chin-na. From the clinch, you can then go into your locks-attacking the neck,arms, legs, waist,etc.
I dunno, is it age? But, for the record, I'm fifty, and hell yeah, I'm a grouchy old fart like 47. But I actually think it is not the chronological age, but the age in Martial Arts, meaninig the experience that causes us to get short with some of the posters here, who are not only young in years, but young in experience. Don't get offended. Some of us old farts actually have some wisdom.
Of course, by that time, alzhiemer's has set in, so we're just dottering old fools.
So STFU and change my diaper, dammnit!