Referring to the age range of people typically between 30 and 39 years old.

The decade in which people are in their thirties.

तीस साल की उम्र के लोग

English Usage: She is really enjoying life in her thirties.

Hindi Usage: वह अपनी तीस के दशक में जीवन का आनंद ले रही है।

A time when individuals typically establish their careers and families.

एक ऐसा समय जब व्यक्ति आम तौर पर अपने करियर और परिवार स्थापित करते हैं

English Usage: He made significant progress in his career in his thirties.

Hindi Usage: उसने अपने तीस के दशक में अपने करियर में काफी प्रगति की।