Table 1.

Cutaneous aging modalities (from [7]).

Aging parameters	Determinant factor
Chronology	Elapse time
Genetic	Genetic (premature aging syndromes, melanotype-phototype-related)
Actinic	Ultraviolet and infrared irradiations
Behaviour	Diet, tobacco, alcoholic abuse, drug addiction, and facial expressions
Endocrinology	Pregnancy, physiologic, and hormonal influences (ovaries, testes, thyroid, adrenals, growth hormone, etc.)
Catabolism	Chronic intercurrent debilitating disease (infections, cancers)
Gravitation	Earth gravity