Lifespan of native aussie shrimps

[Blastedporpoise]

Hey all, I'm new to Skf here but not that new to keeping native Aussie shrimp, and was wondering what the lifespan of some of our natives were? I have some Caridina typus and was wondering if they were as long lived as their amano cousins (considering that they can live up to a decade) and same goes for riffle shrimps too. From my experiences most of the smaller natives like DAEs and the like only live a few years at most. 

[Grubs]

I've had some C. typus for ~5 years and DAS for about the same but numbers have dwindled so I'm not expecting them to live on much more than that.