Structure and function of skin, hair, and nails, and how these change with age

Overview

Skin, hair, and nail structure/function change predictably with age - epidermal thinning, dermal collagen/elastin loss, reduced vascularity, and appendageal changes collectively increase vulnerability to injury, impaired wound healing, and altered disease presentation in older patients
Universal, progressive process affecting all older adults to some degree, with substantial inter-individual variation from cumulative sun exposure (photoaging) superimposed on intrinsic chronological ageing

Epidermis: thinning and flattening of the dermal-epidermal junction (rete ridge flattening) -> increased fragility and shear injury risk (relevant to skin tears)
Dermis: reduced collagen and elastin synthesis, reduced dermal vascularity -> reduced tensile strength, impaired thermoregulation, and slower wound healing
Appendages: reduced sebaceous gland activity (dry skin), hair greying (reduced melanocyte activity) and thinning, nail growth rate slowing

Clinical recognition rather than a specific investigation: age-related change is inferred from the combination of patient age, typical distribution (sun-exposed sites for photoaging-predominant change), and absence of a specific disease process

Practical implications: increased skin tear and pressure injury risk in aged skin (thin, fragile, poorly vascularised) - informs preventive skin care and careful handling in older/hospitalised patients
Slower wound healing affects post-procedural advice and expectations after any dermatological intervention in older patients
Altered drug absorption/effect through topical skin (thinner stratum corneum can increase topical drug absorption in some contexts) is a practical prescribing consideration

Skin tears (fragility-related), pressure injuries (reduced dermal cushioning/vascularity), photoaging (cumulative UV-driven collagen/elastin loss superimposed on intrinsic ageing), impaired wound healing in older patients

Age-related skin fragility and impaired wound healing are not just cosmetic observations - they directly inform practical clinical care (careful handling to avoid skin tears, pressure injury prevention, and realistic wound-healing timeframe expectations) in the care of older/hospitalised patients

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