noun
1. mental infirmity as a consequence of old age; sometimes shown by foolish infatuations
• Syn: ↑dotage, ↑second childhood
• Derivationally related forms: ↑senile
• Hypernyms: ↑old age, ↑years, ↑age, ↑eld, ↑geezerhood
2. the state of being senile
• Derivationally related forms: ↑senile
• Hypernyms: ↑oldness
Useful english dictionary. 2012.