Default [Q] how to change gmail DOB

Hi

Not sure where to ask this.

When I first created my gmail account years it was only to have a look and it wasn't my primary (or even secondary) account and I must have entered a random DOB . Problem is that I now have issues with age restricted content on YouTube etc and I have no way of updating my age.

Is there any way (or even a way of requesting from google) that I can update my DOB ?

Thanks