Method of obtaining an active ingredient increasing cutaneous cell and tissue longevity, active ingredients and compositions

A method of increasing cutaneous tissue longevity and cutaneous cellular longevity, comprising applying a Myrtus communis active principle having:

• a percentage of dry materials ranging between 20 and 200 g/L,
• a pH ranging between 3.0 and 6.0,
• a content of total sugars ranging between 5 and 64 g/L,
• and a content of total phenols ranging between 0.5 and 10.5 g/L
• to human skin, wherein the active principle is obtained by a method comprising:
• (a) solubilizing Myrtus communis leaf powder in water in acid medium to form a solution,
• (b) carrying out simultaneous and/or successive enzymatic hydrolysis/hydrolyses on the solution of (a),
• (c) separating the soluble and insoluble phases of the hydrolyzed solution of (b) by filtration, centrifugation or decantation, to obtain an enzyme-containing soluble phase,
• (d) inactivating the soluble phase of (c) by thermal treatment,
• (e) purifying by clarification, thereby providing an active fraction,
• (f) concentrating the active fraction to provide a concentrated solution of the active fraction, and
• (g) filtering the concentrated solution.