I'm the senior student in a very small, isolated dojo.
It's frustrating not having other senior students to train with and not being able to just visit another dojo/instructor by driving a few extra minutes in another direction.
The dojo is like a large, nuclear family. The older have to care for the younger to raise them correctly. In turn, this teaches the older responsibility and nurturing.
If the older don't learn responsibility and nuturing, their own family, if they try to have one, will be dysfuntional.