Biblical Time Measurement Vs Modern Time Measurement

Conceivable -- sure. But highly implausible.Maybe length of life has evolved during the duration that homo sapiens has existed. But the change isn't likely to have happened in the last 6000 years. And it isn't likely to have been that large a change.It is far more plausible that a different calendar was used (different year length), or that the numbers were exaggerated, or that it is all myth.

6000 is too short for the age of the earth and other aspects of the creation story. However, it is about right for a written record, which include material transcribed from folk lore. Collective memories don't go back all that far. But it wouldn't go in the same spurts in China, in Africa, in Europe, in the middle east. There should be some human populations still existing where people live to almost 1000. Where are they?