I beg to differ, the Spurs maybe older but Coach Pop is the best coach in the NBA and has been able to rest his players all year. The Spurs have only one player who averages more than 30 minutes a game (Leonard - 31.7) and only three more that average more than 25 minutes a game (Parker - 28.6, Duncan - 28.9 and Green - 28.7) then they have three more that average over 20 minutes (Diaw - 24.4, Ginobili - 22.7 and Bellinelli - 22.5). They have 11 players that average over 15 minutes a game. Pop knows how to spread it around to keep his players fresh for the playoffs. In the Spurs last ten games they have had only 11 players play more than 30 minutes and only 34 players average more than 25 minutes. That is called resting your players for the playoff run, Pop does this better than anyone. Oh yea, and they have won all ten of those games with an average margin of victory of 15.7 with a 15 point win over the Warriors.
Now lets look at the Warriors, who are younger than the Spurs. The Warriors have had three players who have averaged over 30 minutes a game, (Curry - 32.8, Thompson - 32.1 and Green - 31.7) and have 2 more players that average over 25 minutes a game, (Barnes - 28.4 and Iguodola - 27.0). They have only eight players that average more than 15 minutes a game. Even though they are younger overall, I believe the minutes will catch up with them just as much as the Spurs. In the last 10 games the Warriors have had 23 players play more than 30 minutes a game and 45 players play more than 25 minutes. Their average margin of victory is only 6 points a game with 2 losses, with one being to the Spurs by 15 points.
By looking at the numbers I honestly feel the Spurs will be fresher going into the play-offs than the Warriors. I realize the Warriors players are much younger but I think the Spurs team-concept play will win out in the end. I believe the western conference finals will come down to the Warriors and the Spurs, with the Spurs winning in 7 games.