In most countries, children in primary and secondary school are sorted into classes based on their age. 'Academic ability' refers to the knowledge of the students, their academic results and level of engagement with the material being taught.

Microretirement refers to taking a chunk or multiple chunks of time off work to experience life and travel while you're young, rather than waiting until actual retirement age in your 50s or 60s. It's similar to a sabbatical, and has also been dubbed an 'adult gap year'.