Roman Opalka, who painted...

...consecutive numbers on canvas, died at age 79 (my emphasis):

Starting at the top left of a canvas measuring a little over four by six feet, and using acrylic paint, he used a fine brush (No. 0) to inscribe 20,000 to 30,000 white numerals on a black background in neat rows that ended at the bottom right corner. Each succeeding canvas, or “detail” as he called it, picked up where the previous one left off. As of July 2004, he had reached 5.5 million.

In 1968 Mr. Opalka changed his background color to gray, and four years later, as he passed the one million mark, he began adding a tiny amount of white paint to the background color after each canvas to lighten it gradually. By 2008 he was painting white numerals on a white background whose color he called “blanc merité,” or “well-earned white.”
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Five years after executing his first numeral painting, he ceased all other work and devoted himself fulltime to the pursuit of infinity. In 2010, Christie’s sold three of his number paintings as a unit for $1.3 million.