Do you need to buy a children's ticket when going as a 4-year-old child?

Children aged 6 years old or below (including 6) or with a height of 1.3 meters or below (including 1.3) can enjoy free ticket discounts.
Anyone under 1.3 meters tall gets free admission, those over 60 get free admission with ID, and anyone above 1.3 meters pays half price; my son was just 1.3 meters tall so I bought a half-price ticket proactive
Six years old and below are entitled to free admission for children.
Children aged 5 or below (including 6 years old) or under the height of 1.3 meters (including 1.3 meters) are eligible for a free ticket discount.
Under 1.3 meters, free ticket; over 60 years old, free ticket (with ID); above 1.3 meters, half-price ticket. I just had my son measure exactly 1.3 meters, so I voluntarily bought a half-price ticket.
Translation:

Children aged six and below enjoy free admission benefits.