has been ageing

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of age (3rd person singular).
  age

  noun

  the length of time during which a being or thing has existed; length of life or existence to the time spoken of or referred to.

Related Words

• century
• date
• day
• era
• generation
• life
• millennium