By the time I was ten years old, I spoke English better than my immigrant parents did. Every night, as they diligently perused Time, Newsweek, or Reader's Digest in an effort to improve their English, they would stop periodically to ask me for the definitions of the new words they encountered.
Over the years, I've tried to modernize their approach to learning new words. Although they read online now, they still don't use online dictionaries ("I don't want to leave the page I'm on!") or save their words so they'll remember them ("Takes too long to type them up!").