longevity (n.)
- age
- animation
- antiquity
- birth
- constancy
- continuance
- debility
- decrepitude
- dotage
- durability
- duration
- eld
- endurance
- existence
- feebleness
- haleness
- hardiness
- heartiness
- immortality
- infirmity
- lastingness
- life
- lifetime
- liveliness
- living
- lustiness
- maintenance
- oldness
- perdurability
- perennation
- permanence
- perpetuity
- persistence
- ricketiness
- robustness
- ruggedness
- senility
- stability
- standing
- steadfastness
- strength
- superannuation
- survival
- viability
- vigor
- vitality
- vivacity
