You must own your home and all owners must be at least 62 years old.
Generally, your home must be your "principal residence". This means you must live in it more than half the year. For a federally insured HECM, your home must be a single-family property, a two- to four-unit building, or a federally approved condominium or Planned-Unit Development (PUD). For Fannie Mae's "HomeKeeper" mortgage, it must be a single family home, PUD or condominium.
Reverse mortgage programs do not lend on cooperative apartments or mobile homes, although some "manufactured" homes may qualify if they are built on a permanent foundation, classed and taxed as real estate and meet other requirements.
Again, if you have any debt against your home, you must either pay it off before getting a reverse mortgage or use an immediate cash advance from the reverse mortgage to pay it off. If you do not pay off the debt beforehand, or do not qualify for a large enough immediate cash advance to do so, you cannot get a reverse mortgage.