Katsushika Hokusai (1760-1849), the famous Japanese Ukiyo-e Print artist said

"From the age of five I have had passion for sketching the form of things, from about the age of fifty I showed a number of drawings, yet of all I drew prior to my seventies there is truly nothing of any great note. When I was seventy-two I finally made out something of the shape of grasses and trees, the structure of birds and other animals, insects, fishes. Therefore when I become eighty I shall have made more progress; in my nineties I shall have penetrated even further the hidden meaning of things; at the age of a hundred I shall have reached the divine mystery, and at one hundred and ten even dots and lines will surely possess a life of their own. I only beg those of you who will live long enough to verify the truth of my words.

http://www.katsushikahokusai.org/

Katsushika_Hokusai_-_Thirty-Six_Viewe.