Some children look like mom and some look like dad, but most look like a patchwork quilt of both. If you've ever wondered what your favorite celebs' visages were like when they were younger, and wanted to know how similar they looked to their kids at the same age, you've hit the jackpot.
Kirk Douglas and Michael Douglas at 34

No seriously, which one is which here? Kirk is on the left, right? Kirk lived to the ripe old age of 103, and he's clearly passed his winning genes on to Michael, who's still going strong at age 77. And still hasn't lost that impressive hairline.