JERRY LEE LEWIS, 85, TRAGIC SECRET LIFE

Grumpy rock legend spends most days staring out the window

ROCK legend Jerry Lee Lewis vowed to keep wailing ’til the end, but the 85-year-old stroke victim now spends his days listening to his old hits and staring out the window, say sources.

The Great Balls of Fire wildman’s health has taken a tragic turn for the worse since he was clobbered by the stroke last year, insiders dish.