Do electrolytic capacitors blow up when old?

Electrolytic capacitors sometimes blow up -- due to heat, old age, or lack
of use(?).

I have some old studio flashes used for photography and they contain some
high voltage electrolytic capacitors. I use them once in a long while. But
if they ever blow up, it would be very unpleasant.

Could someone reassure me that it is not going to happen, or suggest a
solution?


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