Try an example

: born in 1996.
died on August 19, AD 14, aged 75, a month before his 76th birthday. That puts his birth in 63 BC, not the 62 BC a plain subtraction gives: there is no year zero to count.
, born in February 1809, turned 54 in 1863, so he was 54 at Gettysburg that November.
, born in July 100 BC, would have turned 56 in 44 BC. He was killed on the Ides of March, before his birthday, at 55.

How to work out your birth year from your age

Subtract your age from the current year. If your birthday has not come yet this year, subtract one more. At 30 in 2026, that is 2026 - 30 = 1996 once you have had your birthday, and 1995 before it.

That second step is why an age on its own always fits two birth years. Forms that ask for an age instead of a date of birth lose this, and so do quick answers that only subtract: they are right for everyone who has had their birthday this year and a year off for everyone else.

Birth year by age in 2026

Age	Birthday already had	Birthday still to come
1	2025	2024
2	2024	2023
3	2023	2022
4	2022	2021
5	2021	2020
6	2020	2019
7	2019	2018
8	2018	2017
9	2017	2016
10	2016	2015
11	2015	2014
12	2014	2013
13	2013	2012
14	2012	2011
15	2011	2010
16	2010	2009
17	2009	2008
18	2008	2007
19	2007	2006
20	2006	2005
21	2005	2004
22	2004	2003
23	2003	2002
24	2002	2001
25	2001	2000
26	2000	1999
27	1999	1998
28	1998	1997
29	1997	1996
30	1996	1995
31	1995	1994
32	1994	1993
33	1993	1992
34	1992	1991
35	1991	1990
36	1990	1989
37	1989	1988
38	1988	1987
39	1987	1986
40	1986	1985
41	1985	1984
42	1984	1983
43	1983	1982
44	1982	1981
45	1981	1980
46	1980	1979
47	1979	1978
48	1978	1977
49	1977	1976
50	1976	1975
51	1975	1974
52	1974	1973
53	1973	1972
54	1972	1971
55	1971	1970
56	1970	1969
57	1969	1968
58	1968	1967
59	1967	1966
60	1966	1965
61	1965	1964
62	1964	1963
63	1963	1962
64	1962	1961
65	1961	1960
66	1960	1959
67	1959	1958
68	1958	1957
69	1957	1956
70	1956	1955
71	1955	1954
72	1954	1953
73	1953	1952
74	1952	1951
75	1951	1950
76	1950	1949
77	1949	1948
78	1948	1947
79	1947	1946
80	1946	1945
81	1945	1944
82	1944	1943
83	1943	1942
84	1942	1941
85	1941	1940
86	1940	1939
87	1939	1938
88	1938	1937
89	1937	1936
90	1936	1935
91	1935	1934
92	1934	1933
93	1933	1932
94	1932	1931
95	1931	1930
96	1930	1929
97	1929	1928
98	1928	1927
99	1927	1926
100	1926	1925

What year was it 10, 20 or 50 years ago?

Subtract the number of years from 2026:

5 years ago: 2021
10 years ago: 2016
15 years ago: 2011
20 years ago: 2006
25 years ago: 2001
30 years ago: 1996
40 years ago: 1986
50 years ago: 1976
60 years ago: 1966
70 years ago: 1956
75 years ago: 1951
100 years ago: 1926

The other way round, a year's distance from now is 2026 minus the year: 1990 was 36 years ago, 1980 was 46, 1970 was 56 and 2000 was 26. For years BC, or two years neither of which is this one, the BC/AD years calculator shows the sum.

How old was I in a given year?

The second calculator answers questions like "how old was I in 2008?" or "how old will I be in 2040?". Subtract the birth year from the other year to get the age you turn that year; before your birthday that year you are one younger. Someone born in 2000 turns 40 in 2040, so they are 39 until the birthday and 40 after it.

Birth years BC

The calendar goes straight from 1 BC to AD 1, with no year zero, so a plain subtraction across that line comes out a year wrong. The calculator counts in astronomical years (1 BC is year 0, 63 BC is year -62), where subtraction works, and turns the answer back into BC or AD. That is how Augustus, 75 in AD 14 and not yet 76, comes out as born in 63 BC. Ages from ancient sources are often approximate, since a birth date was not always recorded.

Related tools

To see which generation a birth year belongs to, use the generation calculator. To find the weekday you were born on, use the day of the week calculator. To work out exactly how old someone was when they died, in years, months and days, use the age at death calculator.

Your years on a timeline

Once you know the years, the next question is often what happened in them. To lay out your own life, or a family's, year by year, Preceden can put it on a timeline.

More free date and time tools

What Year Was I Born? Birth Year Calculator