Green Card renewal at 14 yo

Hi, my kids will turn 14 at 2021, their current GC is valid until 2022 (they will be 15 years and 10 months at that time).

We are planning to apply for the renewal when they will turn 14 (Reason for Application - 2.g.1. I have reached my 14th birthday and am registering as required. My existing card will expire AFTER my 16th birthday. )

My question is: will the new GC be issued for the next 10 years or for the remaining 1,5 years?

Thank you!