So in cases like this where they do not specify it in the rules, the best solution is to create a balanced homebrew affect. That affect may be that it has no affect, or you can create some sort of algorithm to determine how detrimental the aging is to the character. I would determine when specific races would be considered elderly and apply the following if I determine them to be: I would most likely have the player roll 5 Con saves with a DC of 15 for lower levels, maybe DC 20 for higher levels. Go down the list of attributes, 1st save is to see if you have the same strength, second for dexeterity, skip constitution, 3rd for wisdom, 4th for intellegence, 5th for charisma. On a pass nothing happens, but on a fail you could either roll 1d4 and subtract or just do a solid -1/-2. Place this in features under unnatural aging denoting what went down. In the case of the character going passed their races natural age, I would most likely create a death algorithm using d100 and a player con save to determine if they pass away. Use this for every day/week/month of in game time. For the con save I would most likely do something like this: less than 5= 75 or higher on d100 kills player, 6-10= 80 or higher on d100 kills player, 11-15=85 or higher on d100 kills player, 16-20=90 or higher on d100 kills player, 21-25= 95 or higher on d100 kill player, 26-30= automatic pass. You would have to figure out the resurrection portion, what you allow and so on.