Elon Musk is full of bold predictions, but none may be as controversial as his conclusion that a longer human lifespan is something that can be engineered.

The 54-year-old Tesla boss apparently sees longevity as merely a problem to be overcome—and one with a solution that’s not “particularly hard” at that, he said during an interview on the Moonshots with Peter Diamandis podcast last week.

“You’re pre-programmed to die. And so if you change the program, you will live longer,” he said.

Take, for instance, that every part of the body ages in sync, he argued. Something must be at the root of such synchronization—something that can be identified and potentially altered.

“When you consider the fact that your body is extremely synchronized in its age, the clock must be incredibly obvious,” he said. “Nobody has an old left arm and a young right arm. Why is that? What’s keeping them all in sync?”