S.H.
My son takes Piano and my daughter.
My son started when he was 5, he is now 6.
But he loves it.
HE wanted to take piano.
He practices, without my even having to nag or remind him.
The Teacher they have, is great with kids, and specializes in teaching kids. She knows about age related development per kids, and their attention spans.
Practicing for my son, is only 15 minutes a day.
Which he does, with no problem.
You need to query potential Teachers. And see what their approach is etc.