In a biological system, the software builds its own hardware, but design is critical, and if you start with digital information, it has to be really accurate.
Now that we can read and write the genetic code, put it in digital form and translate it back into synthesized life, it will be possible to speed up biological evolution to the pace of social evolution.
As the Industrial Age is drawing to a close, I think that we're witnessing the dawn of the era of biological design.
I don't see any absolute biological limit on human age.