To: Why me worry.
I thought the idea of this site was to help one another.
I know / knew, quite a bit but as the years roll on, PCs run more efficiently and less problems arise.
Unless you are working with PCs, day in, day out, one day a problem arises and you just can't remember how you used to solve the problem, it may be that you have never come across this problem, and so it is new.
I believe that is why this site was set up, for people to ask questions, and hopefully, someone here will be able to help.
If you know so much, why not give an answer that helps, rather than insult someone?
If you have time to go through this site & belittle people, I personally wouldn't hire you!