How Old is Greta Thunberg?

Climate activist — live age, birthday and a short biography.

23 years old

Born January 3, 2003 · 23 years, 9 months, 0 days

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Quick biography

Greta Thunberg was born on January 3, 2003, in Stockholm, Sweden. In August 2018, aged 15, she began holding a solo school strike for climate outside the Swedish parliament.

Her protest inspired the Fridays for Future movement, with students around the world joining weekly climate strikes. She addressed the United Nations Climate Action Summit in 2019 and became one of the most recognisable young activists of her generation.

Career highlights

✦2018 — Begins her solo school climate strike outside the Swedish parliament in August.
✦2019 — Inspires the global Fridays for Future student movement.
✦2019 — Addresses the UN Climate Action Summit in New York.
✦2019 — Named Time Person of the Year, the youngest ever.
✦2021 — Speaks at major international climate conferences.
✦2026 — Continues to participate in climate activism and public debate.

Personal life in brief

Thunberg began her school climate strike at age 15 and was named Time Person of the Year in 2019, the youngest ever.

Legacy & influence

In 2019 she was named Time Person of the Year, the youngest person ever to receive the title. She has continued to take part in climate activism and public debate since then.

Frequently Asked Questions

How old is Greta Thunberg?

Greta Thunberg was born on January 3, 2003. This page shows her exact live age in years, months and days, recalculated every day from the verified date of birth — so the number is always up to date.

When was Greta Thunberg born?

Greta Thunberg was born on January 3, 2003, in Stockholm, Sweden.

What is Greta Thunberg best known for?

She is best known as a climate activist who began a school climate strike in August 2018 at age 15, inspiring the Fridays for Future movement, and was named Time Person of the Year 2019.