Depends on the level of awareness.

But if it's simply not to that level, where one can truly understand and comprehend what he's doing, then not likely.

They possibly can be saved, as an infant can be saved, that is God's prerogative (if a sufficient argument can be made for such a thing and I think it can).

But we're not to stretch the truth of the scriptures in such cases, for example, somehow, some way, pagans and natives and indigenous people can be saved, having never heard the truth.

I guess it's possible, but we wouldn't be privy to such thing, and it is not generally the way the Holy Spirit works in the salvation of the soul, it is usually through the Word, reading it, or the preaching thereof.

You are looking at repentance through the lens of salvation by works. Repentance is an attitude, not an action in response to wrongdoing. That attitude carries through senility because it resides in the soul in the keeping of the Holy Spirit. This is why the truly saved do not simply sin to their heart's content despite being dead to sin in God's eyes through Christ crucified. Your only alternative to that is a perpetual prison of sin and repentance which is a silly idea. I mean, what if you sinned and a meteor immediately struck you before you could repent? Do you go to Hell despite Christ crucified, and your acceptance of him as Lord?

I say no. Which, is why niggers are the way they are. They have no ability to think abstractly, therefore they no ability to feel remorse or repent.

"I the LORD search the heart, I try the reins..."