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These suns being so young might be getting pummeled by incoming celestial bodies as the accretion disk of new planets form correct? Could Super Flares be caused by this?

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Re: "But such a flare could also strip the ozone layer; bathing the planet in deadly ultraviolet rays for decades."

Maybe micro-organisms deep underground would survive. The meek shall inherit the Earth.

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Good point! That could have been a way for life to cling on in the early days of the Solar System, when there was a lot more UV radiation flying around. Possibly mirco-organisms could also have survived in chunks of rock thrown up in asteroid impacts, though that's a bit more speculative.

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Ever since I was a kid, I thought it strange that we lived happily on the surface of our planet and not underground, protected from the doom of incoming asteroids and other phenomenon.

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