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Millennium: 3rd millennium
Centuries: 20th century21st century22nd century
Decades: 2010s 2020s 2030s2040s2050s 2060s 2070s
Years: 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049

The 2040s decade will begin on January 1, 2040 and will end on December 31, 2049.

The decade as a whole[change | change source]

This decade will be called "the twenty-forties". The Roman number will be MMXL.

The first baby boomers will be 100 years old in 2046.