As of now we have two options for Enrollment periods for patron categories: 1) A specified number of months 2) A fixed date We want our childrencategory patrons to expire when they reach their Upperage limit (currently 16 years/192 months), irrespective of how long or short time they have been patrons. So, therefore we suggest three options for enrollment periods: 1) A specified number of months 2) A fixed date 3) When Upperage limit is reached