The great toad sage was very young during the time of the sage of six paths (think about that for a second) and yet he is still alive, If I were to calculate his age, it would probably be a couple hundred eons.
The same thing goes for the great snake sage, who is also known to be quite old and is still a thing in the Boruto-verse. Does this mean all Summoning animals can live for eternity if they don't die in battle? Or is it just a feat that can be achieved with sage mode.