Formal:
* बूढ़ा आदमी (būṛhā ādmī): This is the most literal translation and is used in formal settings.
* वृद्ध पुरुष (vriddh puruṣ): This is a more respectful term, often used in written or formal speech.
Informal:
* बूढ़ा (būṛhā): This is a shortened and informal version of "बूढ़ा आदमी".
* बुजुर्ग (bujurg): This word generally means "elderly" and can be used for both men and women. It is often used in a respectful way.
* दादा (dādā): This word is similar to "grandfather" and implies a familial or friendly relationship.
The best way to say "old man" depends on the context and the tone you want to convey.