RB_CH01_Q043. Three children product 36

One analyst (John) is talking to another (Mary) while working on a deal book at 2AM. Mary learns that John's sister has three children. 'How old are the children?' asks Mary. 'Well,' replies John, 'the product of their ages is 36.' Mary thinks for a while and says, 'I need more information.' 'Hmmm, the sum of their ages is the same as this figure right here,' says John pointing at the spreadsheet. 'Still not enough information,' says Mary after thinking for a minute. 'The eldest is dyslexic,' says John. How old are the children?