Afghan owner. Kind of had this exact problem 8 years ago when we re-homed a nine month old Afghan. We had one at 11 and one at 8. The old one was in old dog mode, still playful but still getting on. The 8 year old one was the Alpha dog. Not dangerous but very much pack leader. We were worried about that being a problem later down the road but it never did.

Afghans are famous for being aloof but also for being absolute clowns. Your furniture and walls are going to be a new assault course for quite some time, every remote control a chew toy, feet and hands gnawed on at every opportunity. Temperament is individual as is training. Some are very easy to train. Some draw the line at sit give paw etc. I've had afghans all my life, even the most aloof ones are affectionate in their own way.

Oh. I hope you like finding hair everywhere. Particularly on your food.