If we dont actually see them die, we take the age that they were the last time we saw them and then (2 hours =1 Yr.) we basically estimate how old they might have been. The oldest i have ever seen mine is 71 and she passed about an hour later. (she outlived her husband by 6 years) If i go to bed and mine are 65, come back 8 hours later, I assume they were about 67 when they died. although they actually could have been 69. Hope this Helps..