1. 变老的；变旧的；变陈的
Someone or something that is ageing is becoming older and less healthy or efficient.

2. 变老；变陈；变旧
Ageing is the process of becoming old or becoming worn out.

1. the organic process of growing older and showing the effects of increasing age

Synonym: agingsenescence

2. acquiring desirable qualities by being left undisturbed for some time

Synonym: ripeningaging