There are four children. One of them is one year older than the other. The product of the four ages is 360. How old is the biggest one?

There are four children. One of them is one year older than the other. The product of the four ages is 360. How old is the biggest one?

360 = 2 × 2 × 2 × 3 × 3 × 5 = 3 × 4 × 5 × 6; a: the oldest of them is 6 years old