# Why don't people match 'within the past X days' conditions?

This problem often comes up when you set up a segment to check that someone has *not* performed an action within the last X days. The reason this happens is because we can only check that criteria if they’ve been in Customer.io for at least that many days.

Using “within the past X days” to check whether people have or haven’t done certain actions within a certain time can sometimes be tricky, due to how we store data in Customer.io.

## An example[](#an-example)

Check out this segment, which aims to identify people who have not made a purchase in the last seven days:

[![image.png](https://docs.customer.io/images/image%28152%29.png)](#0f9f052d0e351400ba3a890d0a3185c1-lightbox)

### What you need to know[](#what-you-need-to-know)

To match, people **must have *existed* in Customer.io for at least seven days.** The “age” of a person’s profile in Customer.io is determined either by:

*   The date-time when you added the person to your workspace.
*   The timestamp of the earliest event performed by that person. You can [use back-dated events](/journeys/importing-old-data/#advanced-backfilling-events) to effectively backdate the age of a person’s profile.

If a new user is added and logs in and has made no purchases, they still won’t match; Customer.io doesn’t have seven days’ worth of data to check! This means that you won’t know whether or not a user hasn’t made a purchase within the last week until they’ve been in Customer.io for at least one week.

Technically-speaking, the important qualifier for these negative “has not performed A” conditions “within the past X days” is that people need to have been in Customer.io for at least the value of X days, or have performed an event at least once before X days, in order to be evaluated against that condition.

### Want people to match anyway?[](#want-people-to-match-anyway)

If you’d still want people to match even if we don’t have X days’ worth of data, you can— you just need to explicitly say so in Customer.io, with an **OR** condition. Like this:

[![image.png](https://docs.customer.io/images/image%28153%29.png)](#975df80f126100d98aef9da30f598902-lightbox)

This means that if a person has been in Customer.io for under 7 days, they would match the second OR condition. Anyone who has been in Customer.io for longer than 7 days who meets the first condition will not be evaluated for the second condition since we already know they match.