Most of the volcanoes are located along the tropical rifts of Venus which can be used as an age constraint, given that the majority of them, for example Yolkai-Estsan Mons, or two of the Devana Chasma volcanoes have massive fault scarps cutting through their edifices and summits, which are the result of rifting, but there are no lavas that seem to overlie or pond in these fault scarps, so there must have been a long interval volcanic inactivity and tectonism acting on their volcanic edifices. If the rift system is still active, then Kono Mons must be actively erupting too, given the lack of rift fractures on the lava, making Kono a potentially active volcano and among the few youngest eruptors in Venus.