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> in some past periods, people did not have "identification papers"

You mean last century? People are still alive from then.

Yes, absolutely. I, for example, am one, though I admit I was born only after humanity has visited the Moon. Still, more than 16 years ago.

There's one person left from the previous century too:

Well, she is the last one born in 1800s. There might still be living people born in the year 1900, which is also XIX century.

Shouldn't "previous century" be 1900-1999?