I think your comment is most on point here. I understand the original poster's need to find validation but the reality is the forces that decide whether you can be a successful tech entrepreneur aren't external. It's the Internet for God's sake you can be 15 or 115 and people probably won't even know. Those who will know probably don't care (there have been YCom. startups by people in their 30s)

The question's that matter are internal. Do you still have it in you? The one advantage youth has is energy. Can you work the 7-9 schedule? Can you make it through the 84 hour weeks? Are you passionate enough about your idea to do that?

That's what matters. The rest is just navel gazing imho