Incorrect. Autopilots are commonly used even in general aviation, and you can get your pilot’s license in just a month or two if you had a cooperative flight school. Heck, there are accelerated immersive programs that train you in just 14 days.
You only need ~40 hours (minimum) of flight time to get your private pilot’s license. This isn’t even much different than driving license requirements, except that planes are a lot more expensive to rent and operate.
(And for the record, teens can also use autopilots on airplanes since you can get a student pilot’s license allowing you to operate a plane by yourself at age 16. Roughly the same number of hours of supervised instructional operation as getting a driver’s license.)