original: Montero gave her first public performance at the age of five.
simplifications: Montero began performing at the age of five. Montero first performed publicly at five. Montero first performed in public at five. Montero first performed publicly when she was five. Montero gave her first public show at five. Montero performed publicly at the age of five. Montero first performed in public when she was five. Montero gave her first performance at five years old. Montero made her 1st public act at the age of 5. At the age of five, Montero gave her first public performance.