Comment by kkoncevicius

You can also look at some examples of people from ~2000 years ago, in Greece. For example:

    Plato: 80
    Archimedes: 75
    Marcus Aurelius: 58
    Ptolemy: 84
    Aristotle: 62
    Socrates: 71
    Seneca: 92
    Epicurus: 71

These names are out of the top of my head, ages checked on Wikipedia - seems to be quite in line with the average life expectancy today.