If you work in any new technology field, the chances that your job will exist in the same way 50 years from now is very small.

The job, as you have done it at least, was also not here 50 years before you started doing it.

Did you have any of the same feelings knowing that you were doing a job that has not existed in the world very long? That seems like a strange requirement for a meaningful job, that it should remain the same for 50+ years.

In truth, our world and what we do for our careers is entirely shaped by the time that we live in. Even people that ostensibly do the same thing people have done for centuries (farmer, teacher, etc) are very different today than 100 years ago.