Here's a few examples of fairly revolutionary achievements post-30, even within the relatively narrow field of tech startups:
* Jimmy Wales was 36 when Wikipedia was founded. Larry Sanger was 34.
* Steve Jobs was 30 when he founded NeXT, 31 when he took over Pixar, 40 when Toy Story, their first major film was released, and 42 when he returned to Apple and led them to a major market turnaround, OS X, the iPod/iTunes, the iPhone/AppStore, etc.
* Jeff Bezos was 30 when he founded Amazon, 37 before it turned a profit.
* John McCarthy was 31 when he first designed LISP.
* Marc Benioff was 35 when he co-founded Salesforce.com (I don't know how old his cofounders were.)
* David Winer was 33 when he founded UserLand, 41 before they started offering web publishing software.
* Larry Ellison was 33 when he founded Oracle, 35 when they made their first sale, 40 when Oracle became an ACID-database.
* PG was 40 when YCombinator first launched.
That's just off the top of my head (I had to look up the dates) and I don't particularly pay attention to the age of tech company founders. I'm sure there are dozens of better examples.
For a more comprehensive survey, see http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1431263
I actually kinda hope you're trolling with this comment, you're way off base.
Jimmy Wales - extremely successful options and futures trader
Steve Jobs - I forget what company he was involved with before NeXT, but I think it was pretty big
Jeff Bezos - one of the top people at D.E. Shaw, right under Shaw himself
John McCarthy - programming languages don't really count as entrepreneurship, but I'm sure you could find many examples of old people creating languages
Marc Benioff - youngest VP in Oracle history
David Winer - I really have no idea what UserLand is
Larry Ellison - ok, fine. I guess if you're trying to make Oracle, it's ok to be old. I don't mean that as a slight to Oracle, but I don't think Oracle's story applies to web startups.
PG - I didn't say anything about old people not being able to become investors
And I know Hacker News is mostly that type of person, but you people need a reality check. You can downvote all you want, but it won't change anything. I bet you really wish it could because forums like this are probably all you have left. You're going to wake up tomorrow and do what you're doing. I'm going to wake up tomorrow and do what you dream of doing.
Yes, because everyone who uses the internet is young and because every great company is run by someone young. I honestly can't believe I'm reading a comment that seems to believe the web/business world exists only within a bubble of young people. A huge proportion of great businesses are/were started by "old" people and there are plenty of examples of tech businesses that have been spectacularly successful that were also started by "old" people.
Umm, what are you talking about? This is one of the least intelligent comments I've read on HN, and I've really tried to make sense of it.
You know what they say about Finnegan's Wake? That you can start from anywhere in the book, read to the end, start from the beginning, then read to where you initially started, and the book will make just as much sense.... Well, your comment is a little like that.
If there's a thesis in there, it's something like: "of course, old people ruin anything that has to do with technology." Which is disprovable.