I'm over fifty and just got back from presenting at a major conference. I've managed to say current through 35 years of embedded systems design (hardware and software) as well as a stretch of software-only business. It's really not that hard if you understand your job is to continually be learning. I must be doing it right because often those I'm teaching are half my age.
As an aside, I've done the management track and moved back to the technical track when I found it unfulfilling.