How to generate a cohort of death dates?

Hi, am inquiring on what classes I can possibly consider so as to generate a cohort of death dates that I can use as of this Ticket. According to the comments and description of the ticket, death dates should be considered when outputting a number of patients given an effectiveDate, maximum Age and/or minimum Age. However, am wondering which specific classes I can consider such that I get a “collection” of these patient death dates, iterate them and compare them with the given effectiveDate, maximum age and/or minimum age.