If you did register your Smart-ID account after 13th of May, 2021 using biometric identification as a registration method, then e-service provider can identify your age from your Smart-ID certificate. This might allow you to enter and use e-services, which are not allowed to use for underage people.
How to use the table:
V = Yes, this method is available
n/a = No, this option not available
* = Option available with some limitations
* Geographical restrictions might apply.