thirties
nounUK /ˈθɜːtiz/
US /ˈθɜːrtiz/
The thirties are the years from age 30 to 39.
My mom is in her thirties.
RELATED WORDS
OTHER MEANINGS
2. The numbers from 30 to 39, especially as a range of temperature or values.
The temperature stayed in the thirties all week.
3. The years from 1930 to 1939, a decade in history.
Many people lost their jobs during the thirties.
4. The third decade of a century or of someone's life.
The building was put up in the thirties.