The "Under 20" ranks universities founded in 1999 or after by research impact. We do not include merged or split universities. In such cases, we consider the foundation year of the oldest mother institution. If a university is born from a satellite campus of an older university, we take the year of foundation of this satellite campus as the "date of birth". If the status changed from a college to a university, the foundation date of the college is considered.

We consider universities ranked in our original top 2000 ranking, using the same criteria. Only the top 20 under 20 years old is displayed here.