7. You never pass your genes on to another generation. That's the tradeoff of not having kids, you fail at life.
"failure" and "success" are notions relative to goal achievement, and biology doesn't have goals - it's a mechanistic process.
Of course biology has goals. Every living organism's goal is to propagate its genes to the next generation. For details on this, read The Selfish Gene.
Anyone who made it through the childhood and has no plan to die soon succeeded at life. You probably mistaking it with reproduction, which is often required as ability, not as demand.
It is also pretty rough to label fertile ones as losers.
Sounds like a greater success...