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Rasheed Wallace may be considering retirement after Boston's Game 7 loss. ((Mark J. Terrill/Associated Press))

Fighting to stay on the floor every minute of perhaps the last game of his career, Rasheed Wallace finally threw up his hand when it was time for a break.

And he wasn't the only Boston Celtics player who was tired.

"I think everyone is not only physically fatigued, but mentally fatigued," forward Kevin Garnett said.

Those old guys ran out of gas just short of the finish line.

The Celtics nearly pulled off an improbable championship, leading most of the way against the Los Angeles Lakers in Game 7 of the NBA finals on Thursday night before losing 83-79.

They wasted a superb defensive effort when their offence stalled midway through the fourth quarter. Boston went without a field goal for nearly five minutes, a decisive stretch when Los Angeles grabbed control.

"You know, it's the first time all year that you can actually say at the end of the day we were old at the end of the game because we didn't have enough bodies," Celtics coach Doc Rivers said. "I thought it hurt us."

It was nearly an 18th title for the league's most decorated team, and perhaps its most unlikely. The Celtics were the No. 4 seed in the Eastern Conference after playing .500 ball over the second half of the season and were dismissed as too old to compete for a championship.

"We had so much adversity. That's why putting ourselves in a situation to do this would have been miraculous for us. It would have been wonderful," Ray Allen said.

Instead, they finally looked their age Thursday night. Allen's jumper, one of the prettiest and most reliable in the NBA, was flat all night in a 3-for-14 performance.

Paul Pierce was 5 of 15. Garnett, the other member of the aging Big Three, scored 17 points but managed only three rebounds and couldn't keep Pau Gasol off the backboards.

Pierce and Garnett both bent over with hands on shorts in the fourth quarter, usually a symbol of fatigue. A more recognizable sign: Wallace, another old guy who was forced to start and play 36 minutes because of Kendrick Perkins' knee injury, had to motion to come out of the game when he became winded in the second half.

"He was just trying to figure out a way to stay on the floor," said Rivers, who called the 35-year-old Wallace a "warrior" who was considering retirement.

Rivers said Wallace was battling cramps and strains, which kept him from going inside as he did early in the game.

"We had to keep subbing him for one minute and two minutes, and I thought the reason we got up early was because of Rasheed Wallace," Rivers said. "We got it low in the post, he started scoring, and I thought what happened was late in the game he got tired and had the injuries and we couldn't go down anymore, and I think that had a huge impact on how we were playing. We had to go away from the post almost because of fatigue."

The Celtics led by 13 in the second half with an efficient offence and an even better defence that was frustrating Kobe Bryant. That's what Boston did to get past LeBron James and Cleveland, then defending East champion Orlando in the previous two rounds.

But all those games perhaps took their toll on the Celtics, who simply didn't have the energy down the stretch. They were outrebounded 53-40 and couldn't leap to corral the most important rebound of the game, which Gasol grabbed to retain possession with the Lakers up three and 30 seconds to go.

The Lakers even game-planned for the Celtics' age.

"With the Boston team obviously I saw Garnett fatigue," coach Phil Jackson said. "And that's been one of the issues we've had all the way through this series, is run him hard and keep running him if you get a chance because fatigue will affect his game."

It was a great run for the Celtics. They just didn't have the legs to finish it.

"We were scratching and clawing, trying to do everything we could to try to pull this out," Allen said. "We had an opportunity to win, but it just didn't go our way down the stretch. I don't think we ran out of steam. Lady Luck just didn't bounce in our corner."