Juvenescence

The process or state of becoming youthful, fresh, or vigorous again.

Reach for it when using a rare technical or literary noun for renewed youthfulness

Spring gave the neglected orchard an air of juvenescence.

• everyday

  freshening

  appearance or atmosphere becomes brighter

  not when Freshening suggests a surface change rather than a return of vigor.

• everyday

  revival

  activity resumes after dormancy

  not when Revival may restore an old form without making it youthful.

• warm

  renewal

  fresh strength or purpose returns after decline

  not when Renewal is much wider and carries no specific idea of youth.

• professional

  rejuvenation

  restored youth, energy, or condition is the intended result

  not when Rejuvenation is commoner and can describe cosmetic treatment or commercial renewal.

• formal

  regeneration

  damaged tissue, systems, or communities grow anew

  not when Regeneration has biological and political meanings more precise than juvenescence.

• literary

  renascence

  a cultural or personal rebirth is meant

  not when Renascence is equally rare and usually broader than renewed youth.

• aging
• decline
• senescence

• sense of juvenescence

  New growth brought a sense of juvenescence to the woodland.

• seasonal juvenescence

  Seasonal juvenescence transformed the brown hillside into green.

• period of juvenescence

  A period of juvenescence followed the institution's change in leadership.

Juvenescence is rare and may have technical biological uses beyond the selected positive figurative sense.