Flashbacks can be tricky. It’s tough to make your wise, gravitas-filled, 50+ year-old lead actor suddenly transform into a teenager with floppy hair and baggy t-shirts. Directors used to have to hire younger actors who looked similar to play the parts but now, thanks to the magic of CGI, the stars can just play themselves and be magically de-aged. Westworld did this spectacularly recently with Anthony Hopkins, but it’s not the first. Here are seven impressive CGI facelifts from the movies that will make you believe in time travel. Sort of.