Wordnet 3.0
VERB (1)
1. 
 grow old or older; 
- Example: "She aged gracefully"- Example: "we age every day--what a depressing thought!"- Example: "Young men senesce"[syn: senesce, age, get on, mature, maturate]
WordNet (r) 3.0 (2006):
senesce
    v 1: grow old or older; "She aged gracefully"; "we age every day
         --what a depressing thought!"; "Young men senesce" [syn:
         senesce, age, get on, mature, maturate]