"Churn rates are constant given age" is a model which is generally false-but-useful at SaaS companies, particularly for ages over 2~3 billing periods (months),

"Churn rates are constant given age" is a model which is generally false-but-useful at SaaS companies, particularly for ages over 2~3 billing periods (months), while folks are basically on extended trialing before really deciding on adoption or not.