There are many retroactive exploits in media renderers and web renderers that get fixed in newer security updates but are exploitable on every old version including Android 6. NAT doesn’t save you against that.
Malware that can hit Android 6 can probably also hit Android 7, 8, and 9. Obviously how you use the device makes a difference, but the malware is still being made and you have to be careful.
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There are many retroactive exploits in media renderers and web renderers that get fixed in newer security updates but are exploitable on every old version including Android 6. NAT doesn’t save you against that.
Malware that can hit Android 6 can probably also hit Android 7, 8, and 9. Obviously how you use the device makes a difference, but the malware is still being made and you have to be careful.