Do you think a person playing the piano for about 7-8 years can be as good (and mature) as a pianist that has played twice as long? The reason why I ask this is because, many people believe that they wasted their time all of the years they have been playing the piano, when they look at someone that hasn't played as long as them, play just as well. I am talking about all aspects of playing the piano, and not just performance. For instance, how they practice, how long does it take for the person to play a piece well, etc.
What are your thoughts?