The Raiders release had absoloutely nothing to due with youth or contract since Danny Clark is neither particularly old nor was the final year on his 3 year - 3 million dollar contract particularly expensive. He was released because they moved Kirk Morrison inside, making room for Sam Williams. Clark was then released and the Saints picked him up at near the NFL vet-minimum.
Danny Clark sat on the bench in Nickel and Dime situations with the Raiders suggesting he was a liability in pass coverage.