1. (noun) the time of life between 30 and 40

• mid-thirties
• thirty-something

2. (noun) the decade from 1930 to 1939

• 1930s

1. (noun) the time of life between 30 and 40

• time of life

2. (noun) the decade from 1930 to 1939

• decade
• decennary
• decennium