will have been ageing

• future perfect progressive

  future perfect progressive

  Used to describe a continuous action that will progress up until a designated point of completion in the future.

  of age.
  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