40 Million Dollar Man Frankie Muniz alarmed Malcolm in the Middle fans everywhere today when he casually announced on Twitter that he had suffered a stroke.

"I was in the hospital last Friday," the Agent Cody Banks star tweeted. "I suffered a 'Mini Stroke', which was not fun at all. Have to start taking care of my body! Getting old!"

For the record, Muniz turns 27 tomorrow. Hardly over the hill.

TMZ is reporting that Muniz's friends noticed the actor was "acting really weird" and having speech problems, so they rushed him to the ER where he was diagnosed with a "mini-stroke."

But doctors still aren't sure what triggered the event, and additional test results are forthcoming.

Be well, Frankie!

[H/T: The Blemish, photo via AP]