The first thing every beginner or junior should do when practicing is putt a bucket of balls to help establish solid contact and build their swing around your impact point
Play better golf by practicing good habits, one great example is to work on the tee box while you are playing your round, aligning yourself with a mower stripe or the edge of the tee box and take practice swing feeling your swing line up with your target line
There is no set age to start a child in golf; if they have an attention span and an ability to comprehend then they are ready to learn