In theory, an electolytic cap thats been left without voltage on it for months will have a high leakage current for a short time just after it is powered up again.
Its not at all clear how much leakage current this would be, but i've never been able to find evidence of it being enough to overheat and kill the capacitor.
With el caps, the big evil is operating them, even for very short periods, above their case rated temperature.....if this is done, then that el cap is a gonna, and will soon die completely. Also, operating them at their case rated temperature for their rated hours, as you know, means they are basically dead. Often for 'lytics, you get eg 5000 hours at 110degC (which also means 10000hrs at 100degc, 20000hrs at 90degc, etc etc).
There's 8736 hrs in a year.