Did British Empire and Kenya exist in the same era?

Yes, the two civilizations both existed around 1963 CE.

Which lasted longer, British Empire or Kenya?

British Empire lasted longer (414 years).

British Empire: Avrupa; Kenya: Afrika

British Empire (1583 CE – 1997 CE) and Kenya (1963 CE – present) lived in the same era.

The empire with the most extensive territory in history. It was referred to as "the empire on which the sun never sets."

Republic of Kenya · Africa

Did British Empire and Kenya exist in the same era?: Yes, the two civilizations both existed around 1963 CE.
Which lasted longer, British Empire or Kenya?: British Empire lasted longer (414 years).
Which regions did British Empire and Kenya rule?: British Empire: Avrupa; Kenya: Afrika