The career of a good long-snapper can be quite long.
It's all about accuracy of the snap - not a lot of cutting, speed, other athletic skills that erode.
That said, would obviously want to know why he was released.
And yes, Aiken has had some high snaps.
Others in the around the league cuts thread also agree with the observation that Aiken has been off. Bedard has commented on it. Even I noticed that he made a couple high snaps in the last game. Paxton to shadow roster at least if not brought in for a tryout unless he was cut because of a serious physical problem making him unable to snap and block.