But he hasn't given up airplanes.
While he no longer sits in the pilot's seat, the 93-year-old Allen is still building planes.
Over the years, he has built or restored 15 airplanes.
He currently has three in various stages of construction in a hangar in Clearwater, Florida.
The retired schoolteacher tells the St. Petersburg Times he also has plans for one more solo flight.
He says he wants to pilot one of his planes coast-to-coast for his 100th birthday.