I've been keeping a few southern leopards I rescued from a friends' unkempt pool and the mixture includes some males and females. One of the large adult females who was clearly full of eggs had died all of a sudden. The tank is well maintained and the frogs were not in any stress, she had no signs of systemic illness including edema, "red leg"/micro hemorrhage, just decreased appetite and then lethargy and floppy tone and then death. This brings me to my questions. Is it possible for female frogs to die if they do not discharge their eggs. If she just died of old age, is there anyway to tell how old a frog is/do they show signs of aging? Thanks