[morzh]

Today's electrolytics can sit on a shelf for a while but long term storage degrades the aluminum oxide and so a capacitor stored for years has to be reconditioned.
This, according to, for instance, Panasonic, requires application of the rated voltage via 1k resistor for 30 miunutes. Otherwise restoring current may become too large and damage the capacitor.

http://www.panasonic.com/industrial/comp...pp_dne.pdf


This said, I would not worry about capacitors in RC filtering circuits, but those in rectifier filters, especially the first one, right after the tube, should be paid attention to. And the other one after the choke also.