This year’s Oscars feature the youngest and oldest lead actress nominees ever — Quvenzhané Wallis, 9, and Emmanuelle Riva, who turns 86 on Oscar day. Wallis is a Bayou girl from Houma, La., who likes to play outdoors with her two dogs and ride her skateboard. Riva lives in Paris and has been acting for 55 years. Riva had been primarily out of the movie business since the mid-1980s until Austrian director Michael Haneke lured her back to work with his script for “Amour” and the opportunity to play Anne, a woman nearing life’s end. Wallis was plucked from a casting call of thousands for “Beasts of the Southern Wild” and chosen to lead Benh Zeitlin’s cast of nonactors in her role as Hushpuppy, a little survivalist with an oversized spirit.