Are 16 years old players included in the game?

I found that there is no Jack PORTER (16 yr, Arsenal U17 GK) inside FM24 who made his first start for Arsenal last night.

My FM24 data update is the latest. Is there any way to add him into the game?

Thank you,

Not sure about Porter's case, but maybe it's similar to here: https://community.sports-interactive.com/bugtracker/football-manager-2024-early-access-bugs-tracker/database-and-research/england-premier-division-data-issues/missing-arsenal-gem-chidozie-obi-martin-r17532/ 

Anyway, you may add him… using the editor (?… never used it, so not familiar with this), or if any custom database includes him. May have a look at something like: https://www.passion4fm.com/next-generation-wonderkids-database/