to amass sufficient capital to retire on. It's only getting worse with Trump's...and the GOP's...Ayn Rand, "Objectivist" policies. You can help change this by voting Democrat in coming elections.
As for those who do retire there are innumerable ways of spending your time...Volunteering in secular or Church related projects, pursuing Art interests, Golfing, Gardening, Traveling, helping with grandchildren, getting involved in politics, etc. etc.