This was my initial thought as well. While farmwork and other aspects of rural living is wildly complex, when you have everything pre-setup for you it is easy to learn everything you need to know from an early age. OTOH, when your modern parents leave you with no setup direction for you to follow, and you have to invent your own direction, it takes much more time to build toward that.

Imagine a kid living in the suburbs that wants to do this sort of independent farmwork and self sustaining life from scratch without family support, vs a the child of a farmer.