The Child Stars We Grew Up With: Then And Now

22. Mary-Kate Olsen and Ashley Olsen

The Olsen twins, 12, in their short-lived “Full House” follow-up, “Two of a Kind” (left) and, Mary-Kate Olsen and Ashley Olsen pose backstage at the 2014 CFDA Fashion Awards at Alice Tully Hall in New York, on June 2, 2014.

23. Katie Holmes

Katie Holmes arrives at the premiere of “American Pie 2” in Los Angeles, on Aug. 6, 2001 (left), and Katie Holmes at the Michael Kors Spring 2014 collection during New York Fashion Week, on Sept. 11, 2013.

24. Mayim Bialik

Mayim Bialik, 14, stars in her second television series, NBC’s “Blossom,” in January of 1991 (left), and Mayim Bialik, who plays Amy on CBS’ “Big Bang Theory,” attends the Academy of Television Arts and Sciences’ Performers Peer Group Reception at the Sheraton Universal Hotel in Los Angeles, on Aug. 20, 2012.

25. Scott Baio

Scott Baio in “Joanie Loves Chachi,” a spinoff of “Happy Days” that lasted for two seasons in the early 1980s (left), and Scott Baio at a Los Angeles press conference to kick off National Newborn Screening Awareness Month in 2008.

26. Michael J. Fox

Michael J. Fox, in 1983, as conservative teenager Alex P. Keaton on the TV series “Family Ties” (left), and on Oct. 24, 2011. Struggling with Parkinson’s for much of his life, Michael J. Fox founded the Michael J. Fox Foundation in pursuit of a cure. He still acts in addition to his activism.

27. Fred Savage