If you can cure aging, death itself becomes an engineering problem. Curing aging gives you the time you need to figure out gradual replacement, uploading (transfers, not copies), distributing consciousness across multiple fault-tolerant nodes in orbit or beyond, etc.
Then you have cured death for all practical purposes. You will still be vulnerable to certain cosmic catastrophes (which you can plan around) and the heat death itself, but I would still call that "cured."
Edit reply because of HN rate limit: Transfers are possible, copies aren't our only option. Consider replacing one neuron at the time with an uplink to a virtual neuron in the cloud. An implant (at the cellular scale) reflects communication back to your physical neurons - they don't even notice it disappeared.
Wait for your thoughts to normalize, rinse, repeat. This is gradual replacement. You'd do it with more than one neuron (a cluster of neurons) realistically.
Then you have cured death for all practical purposes. You will still be vulnerable to certain cosmic catastrophes (which you can plan around) and the heat death itself, but I would still call that "cured."
Edit reply because of HN rate limit: Transfers are possible, copies aren't our only option. Consider replacing one neuron at the time with an uplink to a virtual neuron in the cloud. An implant (at the cellular scale) reflects communication back to your physical neurons - they don't even notice it disappeared.
Wait for your thoughts to normalize, rinse, repeat. This is gradual replacement. You'd do it with more than one neuron (a cluster of neurons) realistically.