5 of the most popular stories from Business Insider's year-long series on America's oldest workers

Business Insider has profiled dozens of workers over age 80.

Michael J. Fiedler/Katrina Ward for BI

• Business Insider's 80 over 80 series profiled Americans working into their 80s and 90s.
• Older workers face rising costs, health challenges, and changing ideas about retirement.
• These stories highlight financial struggles, resilience, and the growing number of elderly workers.

A 90-year-old working as a cook at a convenience store. A 93-year-old applying for jobs.