Posted on 01/21/2020 2:25:09 PM PST by yesthatjallen
The 30 year business is mostly the Middle Ages to the 1800s time period. During the time period labeled the Stone Age - people lived into their 50s - 60s. During the much later Old Kingdom Egypt to Roman Empire many lived into their 70 to 90s, although, since these civilizations spanned a long period of time, there were 100-150 year spans when everything went to crap.
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