One problem I give children aged 5 – 7 is the following. How old are you? (They answer X.) How many years did it take for you to become X years old? I've fou

One problem I give children aged 5 – 7 is the following. How old are you? (They answer X.) How many years did it take for you to become X years old? I've found that at 6 years old they start to relate their age with how many years it took to become that age. At 5 they usually can't make this connection.