Decade - 10 years
Century - 100 years
Millennial - 1000 years
Decamillennial - 10 000 years
Centamillennial - 100 000 years
Megaannial - 1 million years
Epoch - 10 million years
Period - 100 million years
Era - 1 billion years
Eon - 10 billion years
Lapse - 100 billion years
Equilibrium - 1 trillion years
Time age - The same age as the birth of the omni-universe [Equal to 69 equilibriums]