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From Discovery 11.2 there ia a new option (seen on the model maintenance page) Number of credential failures that count as one failed access. This slows down ageing of devices where Discovery used to, but no longer has, access to the device. By default the value of this is 5 meaning that there need to be 5 no access failures for age_count to be decremented so effectively ageing is slowed down by a factor of 5. If you want the original behaviour you change change this value to 1.
Thanks Andrew! We made some changes here, but I did not pay attention to this new feature. Exactly what I needed.