Amateur - Over Trader - Taking and following decision out of addictiveness, without some specific exit and entry rule, couldnt hold himself from trading when conditions are odd. Out of addictiveness to trade he will take losses, rather then staying out.
Pro - Trader - No matter what, he sticks to his entry and exit criteria. If no signal then he stays out. Not addicted to trading in wrong conditions.
share market is like a sea and till date i think that i have only gained a drop from it...and no matter how long, it will still be less...experience in share market IMO is when some body is earning regularly in all the market directions. His balance sheet is giving him positive results. Else all the knowledge, all the experience is waste.
There are traders sitting around the world, who are trading for so long with simple trading method like moving averages, on the counter end, there may be new traders, who are working with all the indicators they know. And both are in profit. The person working for so long only knows his own strategy. But the other knows the edge of other systems also. So it hardly matters who is experienced.
All it takes is an adaptive and learning mind.