Date of birth
Individual's full date of birth (year, month, and day). Known or imputed for 226.2 million individuals — 90.6% of Faraday's identity graph.
At a glance
- Coverage today
- 90.6%
- Typical coverage
- 90.6%
- Individuals with a value
- 226.2M
- Median
- Aug 1971
- Most values come
- from the person
- Latest collection
- May 1, 2026
When these dates fall
n = 226,245,234Share of individuals with a known date in each period. The middle 50% falls between Sep 1957 and Jun 1986, shaded darkest.
P10 means 10% of individuals have a date on or before this one, and P90 means 90% do. P25 and P75 bound the middle half. The median is the middle: half fall before it, half after.
Median over time
Jul 1971Dec 1967 → Jul 1971 across 12 collections, shaded between P25 and P75. Estimated from a 1% sample of individuals.
Coverage
Latest collection: 229,689,060 individualsCoverage by state
Percentage of individuals in each state with a value.
Coverage over time
90.6% todayShare of individuals holding a value at each monthly snapshot. A value carries forward for one year.
How we arrive at a value
Whether a value was observed on the person themselves, carried from their address, or estimated from the people around them.
- On the person — 100%
- A named person, from a record about that person.
- From address — 0%
- Not used for this attribute — no value is inherited this way.
- From geography — 0%
- Not used for this attribute — no value is inherited this way.
Coverage, in context
Where 90.6% sits on the catalog’s own coverage range.
Higher coverage than 45% of individual-level attributes in the catalog
Freshness
How recently this was collected, and how often a new collection arrives. Each bar is the number of individuals in that collection. Gaps are real — collection is periodic, not continuous.
Change between collections
The share of individuals whose date is different from the previous collection.
of individuals changed value between the two most recent collections — 27.4× steadier than the catalog median of 13.5%.
Contribution ledger
13 ingestions
1 authority contributed since Jul 2023.
| Observed | Ingested | Count | ID |
|---|---|---|---|
| 2026-05-01 | 2026-09-10 | 266,506,942 | c5492806… |
| 2026-03-01 | 2026-07-01 | 264,096,977 | 1181277b… |
| 2026-02-01 | 2026-07-02 | 264,777,400 | af53c569… |
| 2025-12-01 | 2026-08-11 | 268,508,091 | 84d6a1c5… |
| 2025-11-01 | 2026-08-11 | 268,299,874 | a071c538… |
Technical details
- API name
- date_of_birth
- Category
- fig/life_event
- Type · unit
- Date
- Statistical type
- interval
- Allowed values
- null
- Derivations
- Declared
- — the attribute is self-reported by the person.
- Inferred
- — the attribute is determined by rules or logic.
- Directionality
- null
- Deprecation
- false
In a payload
{
"attributes": {
"date_of_birth": "2005-01-01 and later"
}
}