Understanding Young vs Survivor vs Old in JVM Nodes Stats

I have a basic understanding of young vs old, vs permanent in general context of the JVM heap.

But I was told when I want to monitor JVM heap pressure and gc, I should run

GET _nodes/stats?filter_path=nodes.*.jvm.mem.pools.old
GET _nodes/stats?filter_path=nodes.*.jvm.gc.collectors.old

Can someone help me understand why I should not be concerned with young and survivor for the heap pressure, and young for the gc, and only look at old? Young and survivor seem to have some very active and sometimes large numbers in there.

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