although, i'm bit worried that prime days of those veterans might be well behind
I disagree. Aging (from 30-35) IMO is overrated in terms of player production.
Look at nowadays "aging" veterans:
Jason Kidd (34) - 13.0 PPG | 8.2 RPG | 9.2 APG | 1.6 SPG
Vince Carter (30) - 25.2 PPG | 6.0 RPG | 4.8 APG | 1.0 SPG
Kevin Garnett (31) - 22.4 PPG | 12.8 RPG | 4.1 APG | 1.7 BPG
Tim Duncan (31) - 20.0 PPG | 10.6 RPG | 3.4 APG | 2.4 BPG
Steve Nash (33) - 18.6 PPG | 3.5 RPG | 11.6 APG | 0.8 SPG
Paul Pierce (29) - 25.0 PPG | 5.9 RPG | 4.1 APG | 1.0 SPG
Allen Iverson (32) - 26.3 PPG | 3.0 RPG | 7.2 APG | 1.9 SPG
Ray Allen (32) - 26.4 PPG | 4.5 RPG | 4.1 APG | 1.5 SPG
Chauncey Billups (30) - 17.0 PPG | 3.5 RPG | 7.2 APG | 1.2 SPG
All these guys (bar Pierce) are at or over 30 years old, and still putting up superstar numbers.
I think the trade was great for both teams, and Danny Ainge finally did something right. He got Ray Allen and Kevin Garnett, two of the very best players in the league for Al Jefferson, Wally Szczerbiak, Delonte West, Jeff Green, Sebastian Telfair, Theo Ratliff and a couple of low first round draft picks.
Gerald Green has the tools but so far hasn't done much at all. Jefferson is promising but will most likely never reach Garnett level. Szczerbiak is a solid player, but has a big contract and Ray Allen does everything he does but better. Telfair has tools like Green but hasn't done anything. Delonte West is just an average player. Theo Ratliff was an expiring contract and not much else. Jeff Green could become a good player, but he is an unkown as of now. The first round picks are likely very low, resulting in fringe players/role players.
Nice trade(s).