The year of David's passing

Still looking at all the years mentioned in FNAF Secret of Mimic, to try and pinpoint David's death. I do have a few ideas.

If the Fall Fest fire did happen in 1970, then the year David died would be either 1972 or 1973. Which one depends on if David did indeed die at age 5, or if he died at age 6 like some people theorize.

If the Fall Fest fire DIDN'T happen in 1970, then the two possibilities would be 1975 or 1976 depending on the age of David's death.

Still working on looking at all the years in the game, so I'm hoping to pinpoint his death year down to one possibility or the other soon.