In my 50s having spent my time freelancing tech from military and oil and financial and Internet before it was fashionable, to heating controls and now a part-time PhD.

I've never been very thrilled about shiny shiny for its own sake, but I've been a poster boy for at least one major technology that you'll have heard of.

I'm part time on my research to try to keep my hand in with new tech and start-ups.

There are no fixed ages: it's a matter of interest and intent.