I'd love to see this study but I'm not sure it's possible, especially because of the fact that most startup failures still lead to great success later in life because of, not in spite of, the work done building the startup (whether or not that's fair? well, that's a different question).
For every startup failure that has granted someone the skills to succeed later in life, there's someone who has had their entire life torn apart putting their all into a startup, whether that be founder or an early employee.
We really need to drop the facade that working a startup will always be beneficial to you, or lead you to wealth and/or success. Sometimes, its going to tear your soul from you and you may not come back from it for a long time.
