Conversation so far:
What year did Harry Houdini do the buried alive stunt?
Harry Houdini performed at least three variations on a buried alive stunt. The first was near Santa Ana, California in 1915, and it almost cost Houdini his life.
How did Harry Houdini almost die?
Harry Houdini was buried in a pit of earth six feet deep. He became exhausted and panicked while trying to dig his way to the surface.
Who came to help Harry Houdini during his buried alive stunt?
Harry Houdini fell unconscious and had to be pulled from the grave by his assistants.

Question: How old was he when he did this stunt?
Self-contained rewrite: How old was Harry Houdini when he did his buried alive stunt?