Father is 30 years old, son is 6 years old, father is 60 years old, how old is the son?

According to the perpetual calendar, it takes 30 years for the father to be 30 to 60, so the son is 36 when he is 6. The perpetual calendar provides the most authoritative and accurate perpetual calendar, including perpetual calendar lunar calendar query, perpetual calendar lunar calendar to solar calendar query and old yellow calendar query.