Let's review. What are 21st Century jobs?

There really is no such thing as a "21st Century Job" in the sense that people sort of conceptualize jobs.

The problem with most discussions about labor policy, unemployment, etc. is that people conceptualize jobs in a MORAL sense, not in an economic sense. They think jobs are a MORAL good and an obligation citizens have to society/the nation-state, in the sense kids in a family are obligated to do chores to contribute to the family's well-being.

Conversely, capital/employers do not think of jobs in this sense. They think of jobs as an expense to be minimized and/or avoided. In fact, they have been so successful at minimization/avoidance for so long that the worldwide current demand for labor is significantly less than the available number of people who need to trade their labor for the necessities of life.

As such, anyone who currently possesses a job is really just a form of "lottery winner." The person has found an employment situation where, for the time being, the expense/hassle of replacing him/her with someone/something potentially cheaper is enough that the person is "safe" and "employed." But that can change at the drop of a hat for any number of reasons outside the "employee's" control.

Not everyone can be "winners" under such circumstances, anymore than everyone who plays the Lotto can win it.

Retirement

:)

For most, illusions of progress. For some, a necessity that serves others and allows many people to survive. 

Garbage dump salvaging. 20th century historians  

Cops...military...teachers...trash collectors...auto workers...coal miners...burger flippers...doctors. Need I go on?

Yes.