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This review discusses the biological and cosmetic aspects of hair aging and reports no new clinical results; it highlights current treatments and future research directions to address both aging factors.

This review discusses how aging affects hair follicle stem cells and their environment, contributing to hair loss, and explores strategies to promote hair regrowth, but reports no new results.

In this mouse study, UVA and UVB exposure led to hair follicle miniaturization, graying, and prolonged hair cycle duration, associated with changes in stem cells and increased Wnt signaling activity.

This review discusses the fundamental hallmarks of aging as they relate to skin aging and highlights the prominent roles of oxidative damage and the extracellular matrix in photoaging, reporting no new results.

In this study, researchers found that Elastic Net DNA methylation clocks are not accurate for distinguishing between individuals or identifying health markers, but measuring biological "noise" in stable cytosines may serve as a potential biomarker of aging and disease.

This study found that keratin fibers like human hair undergo thermal and mechanical transitions that can help assess changes from cosmetic processes such as bleaching and perm-waving.

This study highlights the critical role of mitochondria in skin aging and wound repair, suggesting that targeted interventions such as antioxidants, NAD⁺ boosters, and NRF2-based therapies may enhance mitochondrial function and improve cutaneous health.

This study found that mitochondrial dysfunction in T cells led to defective hair follicle stem cell function and premature skin aging signs in a mouse model.

This study found that fibroblasts from mature skin showed significantly reduced mechanical force production compared to young skin fibroblasts, suggesting age-related changes in cellular mechanical properties.

Among Chinese women, this study observed that hair density decreases and scalp erythema increases with age, with most aging features like hair diameter and sebum content peaking in their 40s.

This article discusses the prevalence of female pattern hair loss and reports no new results; the authors highlight its increased prevalence with aging.

This review reports on the effects of aging on hair characteristics such as pigmentation, growth, and structural properties across genders and ethnicities, highlighting the importance of scalp health and suggesting cosmetic solutions to improve the appearance of aged hair.

This source reviews mechanisms and existing treatments for hair aging, highlighting factors like oxidative stress and DNA repair defects that affect hair follicle and stem cell function, and discusses research limitations and future directions in the field.

This study found that in mice, type XVII collagen is essential for controlling epidermal cell proliferation through Wnt signaling, with its deficiency or altered distribution leading to skin hyperproliferation and aging-like changes.

This study found that circadian clock genes are involved in regulating the hair growth cycle, suggesting a connection between daily rhythms and the longer hair follicle cycling process.

This study found that adult mouse dermis can be reprogrammed by epidermal cues to resemble neonatal dermis, with changes in fibroblast proliferation and extracellular matrix composition.

This review examines the effects of menopause on skin aging and suggests hormone replacement therapy may improve some symptoms, without providing new clinical findings.

In this study, researchers reported that chronic UV exposure may contribute to androgenic alopecia progression by influencing hair cycle changes and exacerbating solar elastosis in the scalp.

In this study, researchers identified three molecules in hair that varied with age, suggesting potential markers for aging and targets for cosmetic products.

This study found that as Japanese women age, their hair cuticle becomes more prone to damage, shifting from type L to type E damage patterns, and hair surface properties, including fatty acid content, deteriorate.

This review discusses the extragenital effects of ovarian steroids, particularly focusing on aesthetic endocrinology, which suggests estrogens may slow skin aging post-menopause, though hair loss treatment efficacy is mainly confirmed for minoxidil.

This review explores the cellular and molecular basis of wound-induced hair neogenesis and its relationship with aging but does not report new clinical results, highlighting areas for future research.

More research is needed to understand hair aging and develop effective treatments.

This study examined aging hair follicle stem cells in mice and found that inflammation reduction in dermal white adipose tissue can stimulate regenerative behavior, highlighting its role in hair follicle aging.

This case report describes an adult male from India with Werner's syndrome due to a novel homozygous mutation in the WRN gene, characterized by several premature aging symptoms.

This narrative review synthesized current research on hormonal therapies in cosmetic dermatology, finding they offer promising, evidence-based applications for conditions like aging skin, acne, and melasma, but noting that safety and personalized treatment approaches are essential for responsible clinical use.

This study found that targeting IL-17 signaling in aged skin reduces inflammation and delays age-related traits, suggesting a potential strategy to prevent age-associated skin ailments.

This study highlights recent biological and technological strategies in anti-aging research aimed at delaying aging and related diseases, improving skin healing, and potentially restoring hair growth.

This review explores how radiation-induced hair graying can be used as a model to study the mechanisms behind hair graying, focusing on cellular senescence and potential therapeutic targets to address age-related changes. Results are not provided.

The study identified increased IL-24 expression in keratinocytes and fibroblasts exposed to particulate matter, contributing to skin aging by promoting conditions similar to age-related changes such as increased MMP1 expression and decreased type I collagen production.