Knowing the exact date of death would change almost every decision, from booking a vacation to deciding whether to retire early. Knowing exactly how much money life will require sounds less dramatic, but it could transform financial planning just as dramatically. One answer would put a countdown on life. The other would remove much of the guesswork.
Neither choice comes without complications. A death date could encourage someone to enjoy the present or make every passing birthday feel like a deadline. A precise lifetime financial target could eliminate years of uncertainty, yet it might also tempt someone to treat money as a problem with a guaranteed solution. Before choosing, consider what each answer would actually change.