live marker: age at "program date" (InformationDate)

Description: Calculate the client's age at program date.

Issue: Users sometimes backdate/future date/update records which causes some age specific fields to show up due to using the current age live marker, the client's age at program date may not be the same as the current age.

Outcome: Any field using this live marker as a constraint will use the age at program date and will also align HUD age specific fields.