Josh Brolin [1] may have turned 50 earlier this year, but his shirtless [2] photos are timeless. He plays the big bad villain, Thanos [3], in Avengers: Infinity War [4], but beneath the massive muscular frame [5] and pale purple skin onscreen, is a seriously jacked actor. We recently did a deep dive into his very revealing Instagram account [6], where after staring with our jaws open for far too long, we're convinced he's ageing in reverse [7]. Sir, your birth certificate, please? You don't have to be a Marvel fan to be impressed by the actor's physique, just read on to see Josh's shirtless Instagram photos and as one Twitter user [8] put it best, "Thanos might be a father, but Josh Brolin is a daddy."