Reported by Subramanya at https://mifosforge.jira.com/browse/MIFOSX-2310
Currently under category we have "STANDARD", "SUB-STANDARD", "DOUBTFUL" and "LOSS" options. In which if the Loss is considered as the last category it would be better to set the Max Age as Infinity (Blank) so that for any loans which are due from very long period falls under that category.
Right now application does not support for any fields in the "Max age" field to be blank and displayed error message "validation.msg.provisioningcriteria.provisioningcriteria.maxAge.cannot.be.blank"
If you are talking about removing the method which allows the blank input it, needs to be set in API.