# age_in_years

The current age of the agent in years, including fractional parts of the year.

## Synopsis

```
age_in_years
```

## Description

This factor evaluates to an approximation of the number of years since the agent’s
assigned birthday, using the formula `age_in_days / 365.25`

.

The result is a real number; that is, if `age_in_days`

is `1500`

then
`age_in_years`

evaluates to `4.106776`

. To get the number of whole years, use
`age`

.

This calcuation of `age_in_days`

is exact for agents born during the
simulation period. For agents with birthday’s prior to the simulation
`start_date`

, the calculation of `age_in_days`

assumes `365.25`

days
per year; that is, it may not be accurate due to leap days.

## Examples

Suppose an agent is \(1500\) days old, as determined by `age_in_days`

.
In this case, `age_in_years`

evaluates to `4.106776`

.