In Dragon Ball Super Broly , Broly is measured his power level when he was a kid and the measure is 920. How old was Broly when he was measured 920 of power level?
Well, it is impossible to point out his definite age, however, he was less than a year old. We know this because Broly was born in the Age 732. He was also sent to planet Vampa this year and his power level was 920 when he was scanned there.
Note: This is based on the new Dragon Ball Super: Broly movie. Previously, Broly was born during the Age 737 and Vegeta was born during the Age 732. However, it seems that both Broly and Vegeta were born during the same Age.