My 2000 is since I bought it new in 2011, still within specs.
But you do not know the history. For relative measurements that does not matter much.
You can send it in for calibration, but a goods tracable one with sw adjusting and before/after data is probably more expensive as what you paid for the meter. And only of some value after a few calibrations. If it has a terrible drift and they adjusted it, so it now can go through calibration, you do not know it drifted until after the next calibration. If after a few calibrations a meter does not change you can increase the interval. ( if a spot-on meter for the work you do, is important)
Calibration tells you the meter worked fine, (or not,) the period between 2 calibrations. It does not tell you how good it will be the next year. But based on a series of calibrations you can predict it (as long as it does not get defect)