This might be self-serving, but I'm convinced "year of birth" matters more than age (and, more specifically, "when did you have computers and the Internet" and such).
I think 50 year olds in 2030 will still be involved in tech in ways 50 years weren't in 2000 or 2013.
Yes but there will be differences that may matter a lot. I suspect that a lot of members of my cohort (I'm 36) still have no idea why we would want to tweet. I spent a lot of time on IRC when I was younger (not any longer) and I suspect that both being young as well as birth year play a part in some of these behavior patterns. This behavior and interests would also be affected by other factors that may correalate with age (such as having a spouse and children).
My grandfather bought a home PC when he retired in 1986, and he was in his mid-sixties then. He kept up with new PC technology for many years after that. So there are always outliers!
I think 50 year olds in 2030 will still be involved in tech in ways 50 years weren't in 2000 or 2013.