I used to give private sessions for small groups, corporate groups, and older people. And a few uber wealthy types who wanted to try it out at home vs class; these were my least favorite though they paid the best. There's a decent market for all in this area.

The older people were my favorites. It was usually very hands on, assisted yoga + mobility (e.g., hip and shoulder CARS), core strengthening (e.g., holding plank) and guided meditation.

I've have been teaching Iyengar yoga for over 30 years. I teach both private and group classes. Some of my students have become my friends as well over the years. It is very fulfilling.