Not 2e here either but can second (third?) the no-pedal thing too. With DS we did it the old fashioned way, running behind pushing, which I do not recommend!
He learned at about 7 I think. With DD we found a better plan, which was to use the bike with training wheels for a few weeks to practice pedaling, then take the pedals off and use it as a balance bike for a few weeks, then put the pedals back on again, and voila! Worked a treat and DD was only 4. FWIW I think it helps to practice pedaling and balancing on the same bike then put the two together ...
