I think imagination is at the heart of everything we do. Scientific discoveries couldn't have happened without imagination. Art, music, and literature couldn't exist without imagination. And so anything that strengthens imagination, and reading certainly does that, can help us for the rest of our lives.
Science may explain how humans came into being, but it has no answer to the slippery question of how humans should live. Only literature makes it possible to pose such questions in the first place. And if there is no answer, only literature can point to the impossibility of ever finding one.
You forget everything. The hours slip by. You travel in your chair through centuries you seem seem to see before you, your thoughts are caught up in the story, dallying with the details or following the course of the plot, you enter into characters, so that it seems as if it were your own heart beating beneath their costumes.