Definitely not too old. We recently just hired an engineer who had a degree in Biology, got accepted into medical school, realized he loved tech way more, and then went back to school for engineering. If anything, this was a plus for us, because we knew that this was something he was passionate about. I also personally respect people who are willing to take the scarier path because they want to do something they love. Also worth noting that his engineering degree was only 2 years rather than four, since he already had GEs covered and all of that. So your 5 year estimation might be shorter than you think