I don't think there should be an upper age limit for presidency because it seems that medical science is advancing so that people will live longer, and maybe improve the quality of life for older people. For example, I watched 60 minutes a few days ago and they said how 90% of people born today will live to be 100 years old. And if 90% live to be hundred years old then I guess 30% will leave to be 150.
teachings of the Bible are so muddled and self-contradictory that it was possible for Christians to happily burn heretics alive for five long centuries. It was even possible for the most venerated patriarchs of the Church, like St. Augustine and St. Thomas Aquinas, to conclude that heretics should be tortured (Augustine) or killed outright (Aquinas). Martin Luther and John Calvin advocated the wholesale murder of heretics, apostates, Jews, and witches. - Sam Harris, "Letter To A Christian Nation"