He should be able to support himself at his big age. 

There are a lot of people out there who can’t get a job, no matter how desperately they try. They are constantly searching for any position to put bread on the table, but for whatever reason, nothing is coming through. They might be overqualified for the most entry-level work available, and the companies in their field aren’t hiring because of the economy. They may have always gotten work through friends and family and have no idea how to format a resume or conduct a typical job search. They might have been at the same company for 40 years, and everywhere they apply is discriminating against them for being too old. Whatever the case may be, they are putting in a good, honest effort to get a new job, but for some reason are falling short, not because of a lack of willingness to work. 

On the other hand, there is the extreme of someone who will do anything to avoid working. They will live off their parents, their friends, the government, or their romantic partners for as long as possible, so that they don’t have to put on their big-boy pants every morning and go to work. They have no pride in being responsible for their own destiny. They can’t be honest with themselves about why they are so dependent on everyone else to take care of them. They will make up reasons why they can’t work, even though they are a load of nonsense. It doesn’t matter if their parents or partner has enabled them for years. Eventually, they need to step up and take care of themselves for a change. The stepbrother in this story is one of those people, and he’s trying to get money from his stepsister, who is 15 years his junior.