when he was four,he started playing computer games.(改写句子,句意不变)

问题描述:

when he was four,he started playing computer games.(改写句子,句意不变)
忘了 这是填空题 ------ ------- ------- of four he started playing computer games

He started playing computer games at the age of four.忘了这是填空题 ------ ------- ------- of four ,he started playing computer gamesAt the age