As an experience host I have noticed that the custome types (Adult, Child, and Infant) are automatically calculated age ranges.
How do you change the age range?? For example the adult category is auto-filling to be ages 13+, and children 2-12 years. So teenagers are being priced at adult rates.
children and adults are charged the same, infants stay for free.
You can however charge infants as kids and adults or give some discounts to kids but not automatically, only through a special offer or resolution center