I'm 27 and I just picked my 2016 Tech Package up about 1.5 weeks ago (July 30). 430 miles on it so far and loving every second! A lot of firsts with this car... first sports/muscle car, first Ford, first Mustang, first Shelby...
One of the guys I work with owns one as well, he's about 40 or so and has had his about 4 or 5 months.
This is my second mustang. Traded a '15 GT in for the 350. I have a '16 Charger Scatpack as my daily, though I have only driven it once since getting my 350 since it is such an amazing car to drive