Ever hear the term "mid life crisis"? It exists because people around 40-50 - that is 20-30 years into their job they realize they have been doing the same thing and it is getting boring.

While it isn't too late to consider a career change, I'm not sure that is a good idea. For some it is, but many stay - particularly in tech - because they can make a lot of money and thus afford some hobbies that are not boring. Often this is overall your best course in life: find a hobby you enjoy and keep doing your job.

Obviously everyone needs to make their own decisions.