In the past, unskillful behavior was unknown among the human race. As a result, people lived for an immensely long time — 80,000 years — endowed with great beauty, wealth, pleasure, and strength. Over the course of time, though, they began behaving in various unskillful ways. This caused the human life span gradually to shorten, to the point where it now stands at 100 years, with human beauty, wealth, pleasure, and strength decreasing proportionately. In the future, as morality continues to degenerate, human life will continue to shorten to the point were the normal life span is 10 years, with people reaching sexual maturity at five.
There's a few things that bug me in some sutras, this is obviously one of them. The others include various things in the Lotus Sutra, and there's probably many others that I've not read that will contain things that seem so strange that you wonder how they ever got into the texts. So what do you think the meaning of having this added to the Cakkavatti Sutra is? If it's metaphor, why word it like this?