1. never growing old or showing signs of age
2. not affected by the passage of time; enduring

Examples

• The actress seemed ageless, looking the same at sixty as she did at thirty.
• Ancient Greek sculptures have an ageless beauty that still captivates viewers today.
• Her grandmother’s ageless wisdom guided the family through difficult times.
• The ageless appeal of classic literature continues to attract new readers.
• Despite being over forty, the athlete maintained an ageless physique.
• The ageless design of the building made it impossible to guess when it was constructed.