I agree with padminig. You can't know how worthwhile life is for anyone else. Consider the phenomenon of idiot savants, people, who seem incapable of any self reflection, who are considered mentally deficient in most ways, yet can play the most incredible music after hearing it only once. It seems to me that it might be a hellish existence, and not worth living, but if you could find a way to ask that person (and ask the parents), the answer might be much different. Do you think your pets enjoy living? I think mine do, and I mean really enjoy it. And I don't they are capable of the kind of self examination that Socrates is speaking of. Socrates (at least in the way he's portrayed by Plato; and that's all most all we know of him since he left no writings of his own) was a stickler for defining terms. So I guess, in this case, the key term I'd need defined before making a more thoughtful answer, would be "worth". How are we defining worthwhile? What are various lives "worth", not only to the individuals, but to the rest of the world?