Liza Minnelli was 2 in In the Good Old Summertime when she played the character 'Daughter'.
That was over 75 years ago in 1949.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 78, and has starred in 89 movies in total, 88 of those since In the Good Old Summertime was released.
In In the Good Old Summertime, I think Liza Minnelli looks: