Date of birth 2015

Hi, you may want to open a ticket with Garmin Support directly, since it's mainly just us users here. https://support.garmin.com

For what it's worth though, I'm not certain that any of Garmin's age-influenced fitness metrics would have data in their statistical tables that are valid for such young ages anyhow. The stuff I've reviewed (FirstBeat features) seem to be based on adult populations only (mainly young and middle-aged).

9624005 said:

birthday 22/12/2015 and the application maximun date is 31-12-2007.

That's correct. Only persons older than 13 years (16 years for non-US) can use Garmin Connect. Read more on it here:

What Is the Minimum Age Requirement to Use Garmin Connect? | Garmin Customer Support

Apparently Garmin is happy to sell devices that can be used without an age restriction but doesn’t allow the data to be stored. It’s the same for most apps.

ryanspa said:

Garmin is happy to sell devices that can be used without an age restriction but doesn’t allow the data to be stored.

The data can be indeed used without any restrictions by anyone, but the storage is regulated by the laws. Garmin cannot do much to change the laws and governmental regulations.