From the economics perspective you might be right. But, keep in mind that you will be working with 60-70 yo, who have been working and maintaining the same code

From the economics perspective you might be right. But, keep in mind that you will be working with 60-70 yo, who have been working and maintaining the same code base for the past 30 years. With age, neuro elasticity decreases, comprehending new concepts becomes though. Unwillingness to learn is the killer of any improvement. A grumpy old man might be a funny meme, but, waging a war with your colleagues on every change in the code is a solid drain on your mental health. You’re young, any mistake you might make is a learning opportunity. Learn COBOL if you want, it’s always a plus, but stay in touch with anything else. Work takes a solid part of your life, having good connection with your colleagues, doing stuff you’re challenged by, .. all this is equally important to the job security