Antiquity: 1620

As for antiquity, the opinion touching it which men entertain is quite a negligent one, and scarcely consonant with the word itself. For the old age of the world is to be accounted the true antiquity; and this is the attribute of our own times, not of that earlier age of the world in which the ancients lived; and which, though in respect of us it was the elder, yet in respect of the world it was the younger.

--From The New Organum--

We are the ancients.

Our predecessors didn't have the same concept of history as we do, didn't have all the experiences and information that we do. These are the things which make you old--memories of experiences--and we have a lot of them.

If you want to be a human encyclopedia now you have to settle for a much abridged version. Humans have recorded so many experiences, that no single person can absorb them all. But then, old people often have trouble remembering things.