If this is the first time you've used that connection, it will take a long time for gas to arrive at the valve. Also, the quick-connect fitting on the hose is designed not to allow gas to flow (even with the valve on) if it's not fully engaged. Make sure it's fully clicked onto the gas grill's fitting, turn on the valve, turn on the burner knob, and hold a lit igniter down near the burner. When the gas finally arrives it should light and thereafter work normally unless disconnected for a long period.
It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator