Pierluigi, thanks for the comment! You raise a good point that “how long it takes for YC startups to become a top company” isn’t really what the graph shows, so I’ve edited the text to read “the age of YC’s top companies.” I believe the subsequent conclusions I draw are still valid though, since even though we don’t know how long each company has been on the top companies list, the older and newer additions should more or less cancel each other out such that the overall trends we observe in the age distribution are still meaningful.