Are horses live in a barn for ever?

Domesticated horses either live in a pasture or in a barn. When a horse lives in a barn, there could be many reasons. The land may not support having a horse on it, the horse could be very accident prone, the horse could be ill/old/very pregnant, the horse could be a show horse and the owners want to make sure it stays clean and injury free, or the owners could've simply chosen stall live for their horse.

Stall life isn't the best for a horse, as it's the equivalent of a human living in their closet.