(亦作aging)
mass noun
1- the process of growing old变老, 衰老：
the external signs of ageing
变老的外在标志
as modifier the ageing process.老化过程。
1.1
- the process of change in the properties of a material occurring over a period, either spontaneously or through deliberate action（材料自然或人为的）老化。
1
- (of a person) growing old; elderly（人）变老的; 上了年纪的：
looking after ageing relatives
照顾上了年纪的亲戚
an ageing population.
老年人口。
1.1
- (of a thing) reaching the end of useful life到了使用寿命的：
the world's ageing fleet of oil tankers.
世界上到了使用寿命的运油船队。