James Ivory won the Best Adapted Screenplay Award at the Oscars today. He won this award for directing the film, Call Me by Your Name. The 89-year-old director received this award by sporting a T-shirt with Timothée Chalamet's (the lead actor in Call Me By Your Name) face on it.
This makes him the oldest Academy Award winner ever. In 2011, Christopher Plummer won the Oscar for Best Supporting Actor in Beginners. He was aged 82, and at that time he was the oldest Oscar winner ever.