The term 'RECOVERY OF YOUTH' can be defined as the process of REJUVENATION, which is a 12-letter word. REJUVENATION is the act of restoring youthfulness, vitality, and vigor to a person or thing. It is often used in the context of physical health, but can also refer to mental and emotional well-being. REJUVENATION can be achieved through lifestyle changes, such as diet and exercise, or through medical treatments, such as hormone therapy or cosmetic surgery.