When did the old and new worlds seperate?

The continents of the old world (Europe, Asia and Africa ) and the New world
The Americas ) have been slowly drifting on the surface of the Earth since our
planet became solid . In the last 150 million years, the Atlantic has gradually
opened up, seperating the Americas from Africa and Europe.

Alaska and Siberia were once joined , but at present Alaska and Siberia
are seperated by the Bering Strait.