2020. Starting there...or
2010. Starting there...or
2000. Starting there...or
00 - year one,
01- year two,
...
09 - year 10.
decade
[ dek-eyd; British also duh-keyd ]SHOW IPA
SEE SYNONYMS FOR decade ON THESAURUS.COM
noun
a period of ten years:the three decades from 1776 to 1806.
a period of ten years beginning with a year whose last digit is zero:the decade of the 1980s.
a group, set, or series of ten.
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I've been on this ol' earth for almost five of them and hadn't realized it was an arguable point of beginning.