You can tell how old your Crappie are by taking a scale sample and looking at it under a magnifying glass of microscoper, the scalaes will have annular rings like a tree.... off hand I would say your fishery is overfished instead of stunted, yanno... the folks that fill the coolers and only throw back the ones they have to!
As far as you outboard, tune it up!!!... new plugs, fuel filter, change the oil and filter, change the foot lube, check your owners manual for lubrication points and maintainence schedule!!!