If i were given a chance, I would prefer to die at 80 after living life to the fullest, till my kids are able to manage on their own with their children..
Well id say the oldest i can get. But you gave 3 choices so il just say 80 :p Byt he time im 80 my kids wont need me anymore, i wont be able to do anything active, and il be wrinkly lol :S so yeah there wouldnt be much to live for at that point.