1. long life or the length of life
2. long duration or continuance

Examples

• The longevity of sea turtles can exceed 100 years.
• Regular exercise contributes to human longevity.
• The longevity of this car model is impressive.
• Scientists study factors that affect longevity in different species.
• The company's longevity in the market spans over five decades.
• Good nutrition plays a role in longevity.
• The longevity of ancient buildings amazes visitors.