Final answer:
The service industry has a relatively large share of older workers due to the increasing demand for healthcare services caused by the aging population.
Step-by-step explanation:
The industry that has a relatively large share of older workers is the service industry.
According to the Bureau of Labor Statistics, service jobs, such as jobs in healthcare, require significant education and training and tend to be lucrative career choices. With the aging population, there is an increasing demand for healthcare services, resulting in a higher proportion of older workers in the industry.
For example, as baby boomers age, there is a growing need for healthcare professionals in various roles, from nursing aides to assisted-living staff.