Lifetime of Auricap capacitors ?

Your system may not be resolving enough or your hearing can't or won't hear them.
Try this. It won't cost you anything. Warm up your gear. Listen to a good recording. Power down. Wrap a few turns of masking tape around the glass part of the power fuse in your preamp taking care not to touch the steel caps. Listen again.

If you think other things don't influence sound, why care about audiophile capacitors?