"It's possible for a child to start piano lessons as early as 4 years old. However, there is a lot more to keep in mind when starting piano lessons with a child that young. Starting a child that young on piano lessons can be incredibly helpful to their development and intellectual growth. If not done well it can lead to frustration and disappointment and put them off entirely.
If you would like your child of under 6 years of age to start piano lessons, your involvement as the parent is crucial. I prefer parents of children this age to be present at every lesson. There are two reasons for this:
1) If they know that you are involved and interested, they will be more willing to learn.
2) Young children will need help at home with practise. There is a lot to remember when playing the piano (right keys, right fingers, right hand, curved fingers, etc.) Parents who sit in on lessons can help their child keep all these things in mind."
** No one is ever too old to start to learn to play the piano. Even if you think that you aren't very musically gifted, you can still take piano lessons now and succeed.
The best age to start piano lessons