RK, you are correct about players needing the skill before they can make the power play work. It is a skill and not an age requirement. I recall highly skilled summer teams I worked with that had players who are now in the NHL and the remainder played high level hockey like jr. and college. I could do all of the team play with them because they could take and make passes and carry the puck.
I have found that even with lesser skilled teams teaching them the support in the slot set power play and options high and low helps a lot in the 5-5 cycle and the D skating into the slot before shooting. So even though they may bobble the puck more they are learning how to support and move into the big ice.
In the second semester I will teach the power play to my school skills class so they experience the giving close support with two players and the other two being one timer options. We have been doing games and drills that require support all year and this will give more of a real game context that requires rotation and filling in for each other.
'The Game is the Greatest Coach'
'Enjoy the Game'