With CQL, we now have the "Quantity" data type, which is defined as holding a value and a unit to describe some sort of physical phenomenon. However instead of using this data type, all the eCQMs that have an age restriction use the "CalculateAgeInYears" function, which returns an Integer, and the fact that the assumed unit is "years" is located in the name of the function.

Currently you see this often:
CalendarAge*InYears*At(<input parameters>)>= 18

Instead, age calculations ought to be defined like this:
CalendarAgeAt(<input parameters>)>= 18 "years"