Theoretically a human brain integrated into a robot body could have the longest lifespan and be the most efficient in the work force. Disease would be minimal. But is it in the realms of possibility?
You don't have to answer all the questions.
Could you still have a nervous system through electric impulses imitating the sense of touch?
How would you nourish your brain to sustain life if you don't have a stomach?
Procreation would have to be done prior to becoming a human robot, as this would simply not be possible.
What would the new estimated lifespan be?
A bionic heart would be the most optimal, but would this be possible?
If disease became rampant and technology is very advanced you never know what is in the realms of possibility.