Stupendously large: How big can black holes get? Muse is going to have to rerecord...

Stupendously large: How big can black holes get?

The discovery of ultramassive black holes has raised questions about how these celestial objects first formed in the Universe, how they can grow to such immense sizes.

Call me stupid but it mentions 18 billion light years but the life of the universe is 13 billion years. Don't understand.