They've grown up into the kind of adults their fake parents would be proud of.
Rider Strong
Strong played Shawn Hunter, TV's second least threatening bad-boy (after Fonzie) for seven years until Boy Meets World wrapped in 2000. Since then he's done some behind the camera work, directing a short film called Dungeon Master (centering on a group of dungeons and dragons players), graduating with an English degree from Columbia, and earning an MFA from Bennington. Now it looks like he might be lobbying for a part on USA's next legal drama.
Mara Wilson
Mara Wilson might be the poster girl for the well adjusted post-Hollywood child star. Consistently adorable in '90s kids movies like Matilda, Mrs. Doubtfire, and A Simple Wish Wilson's last film was 2000's Thomas and the Magic Railroad. Now twenty-five she's an NYU grad and blogs about everything from her leaving acting to Ira Glass at the perfectly titled MaraWilsonWritesstuff.com.
Ralph Macchio
Ralph Macchio, aka The Karate Kid's Daniel-san played a teen long after his real high school days would have ended; when the last Karate Kid dropped he was twenty-eight. After landing his first big adult role in My Cousin Vinny he did a few guest appearances on shows like Psych and Law and Order: Criminal Intent, even placing fourth on the 12th season of Dancing With the Stars. His family life is so stable (he and his wife of twenty-five-years have a daughter as well as a son named, of course, Daniel) it was parodied for a Funny or Die video.
Source: imdb.com