Old guard/ New guard

You can use the phrases “old guard” and “new guard” to describe different generations or different groups of people in charge of an organization. In Cuba, the “old guard” is the revolutionary leaders who ruled the country with an iron fist. Will a new guard take over with different views? In technology, the “old guard” is Microsoft, Cisco, and Dell computer, while the “new guard” is Facebook, Google, and Uber.