The pilot reported that has not held any kind of pilot certificate since his student pilot certificate expired about 40 years ago. He also reported that he has no record of receiving any flight instruction. During takeoff, after liftoff from the departure end of the runway, the airspeed was too slow and the airplane would not climb and would not accelerate. The airplane drifted to the left and impacted trees and terrain on the edge of the airfield property. After the pilot and passenger exited the airplane there was an explosion and the airplane was destroyed by the postimpact fire. The pilot reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. He also reported that he is really lucky to be alive after this accident and "this accident will do it for him ... he is going to stop flying now".