Initial findings from the Millennium Cohort Study Age 23 Sweep

In the news

PRESS RELEASE

Substance use on the rise among gen Z in their early 20s

5 March 2026

Adult children and parent on sofa at home

RESEARCH

Gen Z more likely to live with parents in early 20s than previous generations

23 February 2026

DATA RELEASE

Millennium Cohort Study age 23 data now available

11 February 2026

Briefings & Impact

Substance use and addictive behaviours – Initial findings from the Millennium Cohort Study at Age 23

Author(s): Dr Aase Villadsen, Professor Emla Fitzsimons

This briefing uses data from the Millennium Cohort Study to examine generation Z’s substance use and addictive behaviours at age 23.

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Briefing papers

Early family transitions – Initial findings from the Millennium Cohort Study at Age 23

Author(s): Dr Charlotte Booth, Professor Emla Fitzsimons

This briefing uses data from the Millennium Cohort Study to examine generation Z’s living arrangements and relationships at age 23.

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Medium shot of women working together on a community garden outreach project to help improve their local environment. They are wearing hi-vis jackets as they stand together holding pliers, discussing their plan of action in the North East of England.

DATA RELEASE

Millennium Cohort Study Age 23 Sweep

The MCS Age 23 Sweep took place between October 2023 and February 2025. At age 23, 9,675 study members took part in a 60–75-minute survey, either online or with an interviewer. Data from this and other sweeps of MCS are available to download from the UK Data Service.