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I learned about e-Cap aging characteristics with 100 mF mainframe caps sold as surplus to my source in the 60's. I learned that the breakdown forces of an abrupt voltage could warp the foil conductors and short out with a lower breakdown voltage accelerated by a high surge current force with power-on.  So that tells me if you can slowly bring-up AC power with a surge limiter or a variac then you can repeat the reforming less often.

The aging is an oxidation that increases leakage and can be burned off on the electrode interface that can also vaporize electrolyte reducing C. The oxidation increases the ESR which increases the junction temperature.  Electrical insulators are also thermal insulators in most cases.

Actual times to retain lifespan are hard to estimate for optimum value and at some point it is easier to replace all the e-caps .