Fifety-Nine or Unsath

A friend of mine took his dad for a heart check-up to a famous cardiologist (around 75 in age) in New Delhi. The cardiologist started asking questions to my friends dad:

Cardiologist: Whats your age?
Friends Dad: (A little confused) Fifety-Nine (a little pause) Unsath
Cardiologist: Fifety Nine Or Unsath. Bahut difference hai dono mein.
Friends Dad: (Lost in words) Fifety-Nine
Cardiologist: Do you smoke?
Friends Dad: Nahin
Cardiologist to Friends Dad: Lie down on the bed
Friend to his dad: Papa, bistar par late jaaiye
Cardiologist to Friends Dad: Remove your shirt
Friend to Cardiologist: Doctor, my dad does not know English.
Cardiologist to Friend: Mujhe pata hai. Tum chup chap kursi par jakar baith jao. Tabhi maine poocha tha Fifety-Nine yaan Unsath. He replied fifety-nine. I have been in US for seven years. No one speaks Hindi there. Aur hum yahan par bhi hindi bolne mein sharmate hain.