Jon Erlichman (@JonErlichman)

Elon Musk turns 55 today. Here are 55 milestones. Age 54: world's first trillionaire Age 54: takes SpaceX public Age 54: SpaceX acquires xAI Age 54: releases Grok 4 Age 53: launches Robotaxi service Age 53: xAI acquires X Age 53: catches Starship booster Age 53: unveils Cybercab Age 53: first private spacewalk Age 53: Colossus supercomputer Age 52: first Neuralink implant Age 52: launches Grok Age 52: rebrands Twitter as X Age 52: founds xAI  Age 51: launches first Starship Age 51: buys Twitter Age 50: flies first all-civilian crew Age 50: unveils Optimus robot Age 49: wins NASA moon contract Age 48: launches crew to orbit Age 48: ships Tesla Model Y Age 48: unveils Cybertruck Age 48: launches Tesla Megapack Age 47: first Starlink satellites Age 46: launches Falcon Heavy  Age 46: unveils Tesla Semi  Age 45: starts Boring Company  Age 45: opens first Gigafactory  Age 45: founds Neuralink  Age 45: unveils Solar Roof  Age 45: reflies Falcon 9  Age 44: reveals Tesla Model 3  Age 44: lands a rocket booster Age 44: co-founds OpenAI  Age 44: ships Tesla Model X  Age 43: unveils Powerwall  Age 43: launches Tesla Autopilot  Age 41: opens first Superchargers  Age 40: ships Tesla Model S  Age 40: Dragon reaches ISS  Age 39: Dragon reaches orbit  Age 39: takes Tesla public (IPO)  Age 38: Falcon 9 first flight  Age 37: Falcon 1 reaches orbit  Age 36: ships first Tesla Roadster  Age 35: co-founds SolarCity  Age 32: co-founds Tesla  Age 31: sells PayPal to eBay  Age 30: founds SpaceX  Age 30: takes PayPal public  Age 27: founds X dot com Age 27: sells Zip2 to Compaq  Age 24: co-founds Zip2  Age 19: sells PCs in dorm Age 12: codes video game Blastar