Tommy Flanagan was 7 in Ella Fitzgerald: Live in Cologne when he played the character 'piano'.
That was over 50 years ago in 1974.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 58, and has starred in 48 movies in total, 47 of those since Ella Fitzgerald: Live in Cologne was released.
In Ella Fitzgerald: Live in Cologne, I think Tommy Flanagan looks: