To determine who was the oldest at the time of taking the oath as Prime Minister for the first time, we need to compare the ages of the individuals listed when they first assumed office.
Here's a breakdown of the birth dates and first oath dates for each Prime Minister:
| Prime Minister | Date of Birth | Date of First Oath | Age at First Oath |
|---|---|---|---|
| Morarji Desai | February 29, 1896 | March 24, 1977 | 81 years, 23 days |
| Chaudhary Charan Singh | December 23, 1902 | July 28, 1979 | 76 years, 7 months, 5 days |
| VP Singh | June 25, 1931 | December 2, 1989 | 58 years, 5 months, 7 days |
| Atal Bihari Vajpayee | December 25, 1924 | May 16, 1996 | 71 years, 4 months, 21 days |
Comparing the ages calculated:
Morarji Desai was the oldest among the given options when he took the oath as Prime Minister for the first time.
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