How Old Was Gen Z When Schools Closed? The Cohort Split by Birth Year
In March 2020 Gen Z was aged 11 to 23 — one end sitting final exams, the other in primary school. The same event landed on entirely different points of a childhood.
When schools closed in March 2020, Generation Z was aged 11 to 23, meaning the same event reached one part of the cohort during final exams and another during primary school — a twelve-year spread in what was interrupted.
School closures began in March 2020. Generation Z was, at that moment, aged 11 to 23.
That range is the whole point. A single event reached one end of the cohort while it was sitting final exams and the other end while it was in primary school, and those are not the same experience with a different date on it.
Where each birth year was
| Born | Age in March 2020 | Roughly what was interrupted |
|---|---|---|
| 1997 | 23 | Early career, first jobs |
| 1999 | 21 | University |
| 2001 | 19 | Leaving exams, university entry |
| 2003 | 17 | Sixth form, exam years |
| 2005 | 15 | The main examination year |
| 2007 | 13 | Early secondary |
| 2009 | 11 | Primary, or the move to secondary |
Why the spread matters
The phrase "the COVID generation" gets applied to Gen Z as a whole. The arithmetic makes that hard to sustain: a 23-year-old in a first job and an 11-year-old moving to secondary school were affected by the same closure in almost entirely different ways, and both are Gen Z.
If there is a group for whom the timing was most concentrated, it is roughly the 2001 to 2005 birth years — aged 15 to 19 — who were at or approaching the examination years when schools closed. That is a five-year slice of a thirteen-year cohort.
It is also worth noting that the youngest Gen Z, born 2009, were 11 in 2020 — and the cohort immediately after them, Generation Alpha, was aged 10 and under. Much of what gets discussed as a Gen Z schooling story actually landed on Alpha, whose oldest members were in primary school at the time and whose youngest were not yet born.
The second date worth adding
Consumer AI tools became widely available in late 2022. Generation Z was then aged 13 to 25.
Someone born in 2004 was 18 — finishing school as the tools arrived, which means their entire formal education predates them and their entire working life will not. The youngest Gen Z, born 2009, were 13, which puts the arrival in the middle of secondary school.
Two events, two years apart, landing at completely different points depending on birth year. This is the general shape of the problem with cohort-wide claims: the cohort spans 17 to 29 today, and any event that mattered reached each part of it at a different age.
The useful version
If you need to reason about how a particular event affected this cohort, use the birth year rather than the label. The tools above will give you the exact age for any year, and the answer is almost always more specific — and more useful — than "Gen Z".
Compare the neighbouring cohorts at Gen Z vs Gen Alpha, or see why the boundary between them is disputed at when does Gen Z end.