As our population demographics change over the years, employers are finding themselves with a workforce that is ever-changing in composition. While those in the Millennial cohort are finding their feet in the workplace and advancing into more senior roles, there are plenty of Generation Xers and Baby Boomers who plan to stay in the workforce for many years to come. This may mean that employers find themselves with a workforce that has a higher average age than it did in years past. (This can be true even while more and more young workers join the workforce each year.)
Another factor that may increase the average age in the workforce is the fact that more people are transitioning into a new career after their original retirement. Many older workers are even looking for new jobs.