I was in the same boat a couple of years ago but with my daughter as she wanted to ride. We made her take the Motorcycle training course, not sure what insurance rates are like in the US but up here in Canada they are silly for all ages even worse for people under 21, for that reason we started her on a 250 Marauder, yes way too small for someone over 6 feet, but a real good bike to get your feet wet on.
I would go along with a few others advocating a bike with an upright riding position especially for someone who is taller, and the older bikes are great bikes to start on, as mentioned they are pretty reasonable to buy, great way to learn about taking care of a bike, and generally a bit easier on the insurance.
Over this past winter, our daughter has picked up a 750 Virago which for her is going to be almost perfect as a second bike.
My 2 cents
Mike