The 91-year-old, who has finished the marathon 58 times and won twice, is recovering from colon surgery in January and a subsequent bout with pneumonia.

He has been a patient at the Cranberry Pointe Rehabilitation and skilled care centre since March 1 and is scheduled to stay at least another week.

At a news conference yesterday at the rehabilitation centre, Kelley said he would miss next Monday's 103rd running because it could hamper his improving health.

``I need a little more time,'' said Kelley, who won the race in 1935, 1945 and placed second seven times. ``I feel going up to Boston I would lose all I've gained here. You can be sure I'll miss it. It's the greatest marathon in the whole world.''

Race director Guy Morse said Kelley would be missed.

``Johnny has always listened to his body, and his body is telling him it's not quiteready yet,'' Morse said. ``He'll be there in spirit.''

Though this year's race is out, Kelley said he has his sights set on the 2000 marathon.

``That's the biggie,'' he said. ``Hopefully I'll be myself long before then. I'll be the belle of the ball.''

Kelley has run the race 61 times. The past four years, he has served as grand marshal.