Methodology and Sources
Our data for first names in the United States comes from the Social Security Administration. You can read more about their data here, but here are a few important caveats.
- To protect privacy, they only show names where at least 5 babies were born with that name and sex in a given year.
- They ignore punctuation and replace accented letters. Thus, Mary-Jane becomes Maryjane and José becomes Jose.
- They ignore names less than 2 letters in length.
- They truncate names longer than 15 letters in length.
- Their data is based on Social Security card applications and is incomplete for people born before 1937.
To estimate the average age of people who have a given name, we use actuarial data provided here. For example, we can see that, as of 2019, 70.262% of men and 80.245% of women who were born in 1950 are still alive.
If you have more specific questions about our data, don't hesistate to ask.