[Edit: Holy , people. It's an observation, not a complaint. Let me say it up front, before there's a hundred or so posts defending the Spurs' FO for signing vets. I thought maybe it would prepare people ahead of time for the inevitable comments from the sports writers - "Spurs oldest team in league again".]
For all the talk about the Spurs' youth movement this year, it looks like they will probably wind up being the oldest team in the league again. In fact, if the Spurs were to re-sign Bruce Bowen, the average age on the team would only be about 1 month lower than last year. The Spurs currently have 8 players returning from last year's squad, but you have to take into account the fact that they are all a year older this season. The additions of McDyess and Theo Ratliff more than offset the loss of two of the oldest members of least year's team, Thomas and Oberto. Richard Jefferson and Marcus Haislip were both born in 1980, which makes them middle-aged by NBA standards.
I matched players from last season's roster to probable members of this season's roster - not by position, but simply as a way to compare ages on this team to last years'. Note that McDyess is only 1 year older than Oberto, but he is 2 years older than Oberto was last season. (The same applies to the other match-ups on the list.) There are two roster spots without guaranteed contracts, but this example, I assumed that Hairston makes the team and Williams doesn't, and the Spurs re-sign Bowen.
Returning Players:
Bowen/Bowen +1
Bonner/Bonner +1
Duncan/Duncan +1
Finley/Finley +1
Ginobili/Ginobili +1
Parker/Parker +1
Hill/Hill +1
Mason/Mason +1
Mahinmi/Mahinmi +1
Total: +9 years
Replacement Players:
Oberto/McDyess +18 mos
Thomas/Ratliff +6 mos
Vaughn/Haislip -4 yrs 10 mos
Udoka/Jefferson -22 mos
Williams/Blair -17 mos
Gooden/Hairston - 4yrs 5 mos
Total: -10.5 years
Collectively, this year's team would be 18 months younger than last year's team, or about 1 month per player. But even if Marcus Williams is on the team, rather than Bowen, the average age would only drop by about 15 months, which would probably still leave them as the oldest team in the league.
When it's all said and done, it looks like the Spurs' youth movement is moving very slowly.