If you are 100 years old, you would have been born 100 years ago. For example, if the current year is 2022, you would have been born in 1922. This is because your birth year is the current year minus your age.
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If you're 100 years old, you would have been born in 1922. Simple math, honey. Next question!
This depends on what today is. See the related link, "100 years ago today". To calculate late the date, subtract 100 from the current year, and use the same date. For example, of today were July 5, 2015, then 100 years ago would be July 5, 1915, since 2015 - 100 = 1915.
In the year 2094 he/she will become 100 years old, maybe.
There are 100 years in a century.
There are roughly 31,557,600 seconds in a year. 100 years is 3,155,760,000
year = year decade = 10 years century = 100 years millenium = 1000 years.