Thirties
Part of speech: noun
Definition: A decade starting with the year xx30, most usually the decade from 1930 to 1939. A decade starting with the year xx30, most usually the decade from 1930 to 1939. The decade of one's life from age 30 through age 39.
Example sentence: In your teens and twenties, death doesn't exist. In your thirties, you glance down the road occasionally. But then in your forties, it becomes a full-time job looking the other way.
1930s
Part of speech: noun
Definition: The decade from 1930 to 1939.
Example sentence: Out of the suffering of the 1930s, Britain built a civilising society, based in large part on the important lesson that unemployment is rarely the fault of individual malingering but the structural consequence of governments allowing the free market to rule our lives.