The tech industry itself is mostly young. Of course, there were developers 20 years ago, but the big increase in number of people working in tech was as of the

The tech industry itself is mostly young. Of course, there were developers 20 years ago, but the big increase in number of people working in tech was as of the mid 90s. So there aren't that many people aged 45+ working in the tech industry today, simply because the industry is young. This will change in the coming 10 years, and I believe that smart developers who manage to keep their skills sharp and up to date will still have plenty to offer and will be in good shape in the job market.