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This is answered in sk122154: How is Aggressive Aging enforced when Concurrent Connections Capacity Limit is calculated ...

When the connections table sizing is set to "Automatically", if the overall memory utilization of the gateway exceeds the specified threshold percentage, Aggressive Aging will start up and send an SNMP trap if so configured.  So for example if a system has 16GB of RAM and you run free -m, with the default 80% setting the amount of "used" memory would need to exceed ~12.8GB which would correlate to "available" reporting approximately ~3.2GB.  All other values reported by this command such as "free", "shared", and "buff/cache" are irrelevant to this calculation for Aggressive Aging and should be ignored, especially "free" which does not mean what most people think it means.