A person in their thirties, often used to describe someone who is in that age range but whose exact age is unspecified.

तीस के आसपास का व्यक्ति

English Usage: She is a thirty something who enjoys outdoor adventures.

Hindi Usage: वह एक तीस के आसपास की महिला है जो बाहरी रोमांच का आनंद लेती है।