Shannon Chan-Kent was 18 in Betsy Bubblegum's Journey Through Yummi-Land when she played the character 'Betsey Bubblegum'.
That was over 17 years ago in 2007.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 35, and has starred in 41 movies in total, 41 of those since Betsy Bubblegum's Journey Through Yummi-Land was released.
In Betsy Bubblegum's Journey Through Yummi-Land, I think Shannon Chan-Kent looks: