I think the message is getting garbled. The person doing a startup is in their 30s and wasn't fired. The next response was someone offering assurance that even 40 isn't too late in response to their concern that it was "now or never".
I don't think we're advising any particular person, we're just talking about the potential for a dev to do a startup at any point in their life. Obviously if someone is going to attempt a startup they should know their own situation which includes knowing you have enough money and the inclination to go into business for yourself. Whether the 10% would be higher or lower if everyone did it we can't really know. A lot of people that have great ideas and can execute them well probably never attempt to go out on their own, same for the opposite.
I don't think we're advising any particular person, we're just talking about the potential for a dev to do a startup at any point in their life. Obviously if someone is going to attempt a startup they should know their own situation which includes knowing you have enough money and the inclination to go into business for yourself. Whether the 10% would be higher or lower if everyone did it we can't really know. A lot of people that have great ideas and can execute them well probably never attempt to go out on their own, same for the opposite.