I cannot say that your explanation of Oscar Wilde’s quote is incorrect, because I believe quotes to be entirely subjective.
They're not. People say things in a language, wherein each word has a definition and use within proper syntax. If you quote me as saying "I like cuppy-cakes", it really can only mean one thing; That I like cuppy-cakes. You could
take it to mean whatever you want, but I would rather you not quote me to argue for a thing my quote has nothing to do with or in which context it works opposite to what I meant. In this case, J M Barrie (not Oscar Wilde) did, in fact, mean what he said in the way that I said he meant it. Or, more accurately, what a character in one of his plays said.
However, in this context I was intending to use it to explain that we throw away the theories/views we had at age 17 and adopt new ones, we continue to adopt new theories/views all are life. Then we think about the intellectual progress we have made with every new theory/view, without realizing that each new theory/view was incorrect (accuracy is impossible)making future ones also problematically incorrect, hence chances of accuracy are the same as with the original theories, except we have lost assurance.
Perhaps some people may replace old idea/beliefs/theories with equally flimsy and unverifiable ones. I'd like to think that most people actually do learn things once and while, thereby growing more and more able to distinguish between baseless ideals and fact. I know I sure have, but I'm also sure some people have not (Creationists, for example). It's difficult to go through life and not actually learn anything such that all of your beliefs, new and old and replaced and replacement, are all equally likely to be false.
You could argue that we become more accurate throughout life (we do gain rationality but if anything it does not assist accuracy), irrelevant, an incorrect theory is an incorrect theory.
We become more accurate because we leanr facts, which enable us to see the world for what it actually is, more and more as we age. You'd have to put effort into not learning in order to not learn anything. Further, rationality
totally helps us become more accurate, though it also teaches us that we do not necessarily know what we think we know. That's a lesson learned, however, not an actual loss of accuracy. You're accurate whether or not you think you are. That last sentence I actually agree with, though.
You do not get more innocent with age but you do become bitterer (unless your an INFP, god bless them).
Innocence is the lack of having done wrong. As you age, there's a good chance you're wrong once in a while, so innocence is bound to become corrupted. I don't see how innocence is even relevant, though. You'll have to explain that one to me. It sounds at least a little to me like you're at least mildly agist against old people. Don't get me wrong, old people are kinda gross, with their failing body and it's functions, and certainly some do become bitter. I fail to see how that cancels out the happy old people I've met, though. Age is not a direct cause of bitterness, it simply allows for more opportunity to become bitter. When it comes right down to it, though, it depends on your personality. Your personality will liklely be the same throughout your entire life. If you're bitter now, you'll be bitter then. If you're jolly now (as I am), you'll be jolly then.