Did Pakistan and Republic of India exist in the same era?

Yes, the two civilizations both existed around 1947 CE.

Which lasted longer, Pakistan or Republic of India?

Both civilizations lasted about the same time (79 years).

Pakistan: Asya; Republic of India: Güney Asya

Pakistan (1947 CE – present) and Republic of India (1947 CE – present) lived in the same era.

	Pakistan	Republic of India
Period	1947 CE – present	1947 CE – present
Duration	79 years	79 years
Region	Asya	Güney Asya
Capital	—	Yeni Delhi
Type	Country	Republic
Government	Cumhuriyet	Federal Parlamenter Cumhuriyet
Religion	—	Hinduizm, İslam, diğerleri
Language	—	Hintçe, İngilizce
Peak population	216,565,318	1,400,000,000
Rulers	17	8

Islamic Republic of Pakistan · Asia

The world's largest democracy. It gained independence through Gandhi's nonviolent resistance movement. Unity in diversity.

Did Pakistan and Republic of India exist in the same era?: Yes, the two civilizations both existed around 1947 CE.
Which lasted longer, Pakistan or Republic of India?: Both civilizations lasted about the same time (79 years).
Which regions did Pakistan and Republic of India rule?: Pakistan: Asya; Republic of India: Güney Asya