Let me try to add some practical answers:
1. First, you need to give it a full 24 month commitment to hit Initial Traction. 6 months isn't enough. 12 isn't. It's going to take you 9-12 months just to get the product right. And another 6-12 to get any material revenues.
>> Can you "afford" to commit for 24 months just to get to Something? If not, you are too "old". Even if you are just 22.
Slack went from $0 to $12m in '14. But it wasn't founded on 1/1/14. It took them a year to get an MSP. And it was really founded as a company many years earlier:
And you might not be Slack.
In any event, 12 months won't cut it.
2. You have to be able to commit to 8,760 hours a year. 24 x 365. Not to being in the office 14 hours days. That's not really necessary. But to obsessively thinking, worrying, futzing, stressing about how to do The Impossible. Every. Single. Moment of the day.
>> If you don't have the mental bandwidth--you are too "old".
3. You have to have Zero Optionality. This is perhaps most important. If you maintain optionality, it never works. "I'll try for a while and go back to Google if it doesn't work." or "I'll do a lot of consulting while I see if it works." or "I'll raise $500k and see how it works."
This just never works. Great founders maintain Zero Optionality. Not because they are crazy risk takers. But because they just don't see the risk. They have no need of back-up plans. They see The Future.
If you need to maintain optionality--you are too "old".
Chronological age is irrelevant in my experience, and IMHO.
In fact, I'll say as a VC now, I have no idea how old any of my CEOs or founders are. Some have adult kids. Some clearly are relatively green. But--Never asked. Never cared. Just looked at 1, 2, and 3.
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