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how old is the mayan calendar?

The Mayan timeline began on 13 August 3114 B.C.E. (very near the start of the Egyptian Old Kingdom) --- around 5,125-year-old. This is the starting point of the Mayan Long Calendar. The time divisions in the long calendar were:

•           1 kin = 1 day

•           20 kins = unial (20 days)

•           18 unials = tun (360 days)

•           20 tuns = katun (7200 days)

•           20 katuns = baktun (144,000 days, about 394.25 years)

•           13 baktuns = a Great Cycle (1,872,000 days, about 5,125.25 years)