Regen - Contract start dates

Hi fellas

is there any reason as to why regen contract start dates are in some cases 2-3 years in the future?

This means me building out an excellent u18 coaching staff is kind of pointless as the youth intakes for your own club is so sporadic.

Any help would be appreciated

I think some nations dont allow signing of under 18 players so they will start at your club on their 18 birthday