I learned to fly gliders at 24, converted to power at 30 and am now 48. If we want to change the balance we need to keep a higher % of the pilots who pass and then fade away. The key to this is to get to them during the training and educate them that there are many options other than hire an expensive clapped out spam can from a dilapidated ex WW 2 airfield. The micro guys have managed this, and the rest of GA needs to follow ASAP.
Rod1