Rabidin Satir, from Sabah, was sentenced by a sessions court in Raub here.
The accused had pleaded guilty to three counts to raping a 17-year-old girl and an eight-year-old girl in two separate incidents last year.
Two other charges were over raping and sodomising a 16-year-old girl, news reports said.
The rapist used a knife to threaten his victims, Star newspaper said.
When he was first charged last year, Rabidin had pleaded guilty to raping a nine-year-old girl in 2009.
