CLEAN : Iceland: vaccination against Covid-19 starts for 5-11 yo children

The transcript begins with a series of unrelated comments and thoughts, followed by a more focused discussion on the topic of vaccination. The speaker mentions having discussions about vaccination, highlighting that a brother has already been vaccinated and that it seemed like an obvious choice for them.

What does the speaker mean by 'Young mistress. That old saying.'?

What does the phrase 'kind of a no brainer' imply in the context of vaccination?