Manufacturing date will have some influence on when the battery will wear out. But it's probably not that much.
The much larger effect on battery life will be how often the button gets pushed.
People who just leave themselves logged in all the time will not use the button as often since they don't need to log in and thus don't need to use the button when they walk up to the console or computer.
People who log out and log in again every day, or even multiple times every day will use the button much more and the battery will wear out faster.
Also, people who carry the token in a purse or pocket where things might be pushing the button by accident (and keeping it pushed for a while too) will also wear the battery out very fast.
In addition, some batteries just wear out much faster than most. That's just a piece of bad luck, but it does happen.
BTW, the date the security token was activated is available under "Confirm Service History". Selecting "Account Basic Service" and clicking "Display" will limit the list enough to make it easy to see the item with the date in it for the Security Token.

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