Suwanee Creek Software

https://www.techrepublic.com/article/these-old-programming-languages-are-still-critical-to-big-companies-but-nobody-wants-to-learn-them/

These old programming languages are still critical to big companies. But nobody wants to learn them Large organizations still rely on ageing IT systems and programming languages to run their mainframes. But as traditional developers reach retirement age, new hires are reluctant to pick up old skills.

There is actually a lot of good information in this article, and it is well presented:

5 key areas for tech leaders to watch in 2020 Our annual analysis of the O’Reilly online learning platform reveals Python’s continued dominance and important shifts in infrastructure, AI/ML, cloud, and security.