aging phenomena


aging phenomena

Geriatrics The constellation of changes of aging
Aging
Intrinsic aging
The immutable effects of chronologic aging, eg atrophy-attenuation of epidermis, retration of rete pegs, ↓ number of Langerhans' cells and melanocytes, general decay of structural dermal and epidermal components
Extrinsic aging
Effects of external factors, eg sunlight, smoking, gravity and gravidity, keratinocytic dysplasia, solar elastosis, and possibly carcinogenesis; intrinsic & extrinsic aging are intimately linked and thus not subdivided