2040s
| Millennium: | 3rd millennium |
| Centuries: | 20th century – 21st century – 22nd century |
| Decades: | 2010s 2020s 2030s – 2040s – 2050s 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.