"Anything that is in the world when you're born is normal and ordinary and is just a natural part of the way the world works.

"Anything that is in the world when you're born is normal and ordinary and is just a natural part of the way the world works. Anything that's invented between when you're fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you're thirty-five is against the natural order of things."

--Douglas Adams, as quoted by @pluralistic