Mattsson was born in Åsele, Västerbotten County, Sweden, on 17 February 1914. She grew up on a farm outside Åsele where she sometimes milked the cows. At some point, she got a job as a maid in the district of Östermalm in Stockholm.
When she was around 102 years old, she moved into a nursing home. When asked for advice on living a long life at the age of 105, she replied: “Eat normal home cooking, sleep and live as usual.”
Mattsson passed away in Stockholm, on 6 June 2024, at the age of 110 years, 111 days.
At the time of her passing, she was the third-oldest living person in Sweden, after Gunborg Hancock and Agnes Boström, and the second-oldest living person in Stockholm, after Hancock.
Her age was verified by Jimmy Lindberg, and validated by LongeviQuest on 1 March 2024.
* “Östermalms äldsta person, Sanny, tipsar om hur du också lever till 105.” – Mitt i Östermalm, 23 February 2019
* “Sanny på Gärdet fyllde 110 år – näst äldst i stan” – Mitt i Östermalm, 23 February 2024
* “Sanny Mattsson” – Ratsit