What Is Aging?

Aging refers to the processes by which biological organisms, materials, and engineered devices undergo gradual, time-dependent changes that alter their structure, function, or performance. In engineering and technology, the term encompasses two related but distinct phenomena: the physical degradation of components and systems over time due to mechanical wear, thermal stress, chemical attack, and radiation damage; and the social and physiological processes associated with human aging, which have generated a substantial field of technology development aimed at extending healthy independent living for older adults. Both dimensions intersect in areas such as biomedical device reliability, assistive technology, and the design of systems intended to serve aging populations.

The engineering study of material and device aging draws on reliability theory, solid-state physics, and materials science. The study of human aging as a context for technology draws on gerontology, medical informatics, and human factors engineering. Research organizations including IEEE bring the two together by applying engineering methods to the challenges of an aging global population.

Device and Material Aging

In electronic components and systems, aging manifests as gradual drift in electrical parameters caused by mechanisms including bias temperature instability (BTI), hot carrier injection (HCI), electromigration in metal interconnects, and time-dependent dielectric breakdown (TDDB). As semiconductor geometries shrink, these mechanisms accelerate, and maintaining a ten-year design lifetime has become a significant engineering challenge for advanced CMOS processes. Reliability engineers use accelerated aging tests, which stress components at elevated temperature and voltage, to project lifetime under normal operating conditions.

The bathtub curve is the classical framework for understanding device aging over a product lifecycle. Early-life failures, called infant mortality, are screened through burn-in procedures that stress components before deployment. The useful-life period follows, during which the failure rate is relatively low and constant. Wearout failures then accumulate as components approach or exceed their design lifetime. IEEE research on device aging as a reliability and security concern has examined how aging-induced parameter shifts can be exploited by adversaries or unexpectedly affect safety-critical functions.

For electrical insulation in power equipment, insulation life is modeled as a function of cumulative thermal, electrical, and mechanical stress. Standards from the IEEE and IEC define aging classes for insulating materials, linking operating temperature limits to expected service life.

Biological Aging and Gerontology

Gerontology is the scientific study of the biological, psychological, and social dimensions of aging in humans and other organisms. At the cellular level, aging involves the accumulation of DNA damage, telomere shortening, mitochondrial dysfunction, and changes in gene expression that collectively reduce the capacity for cellular repair and renewal. At the systems level, aging is associated with declining cardiovascular, musculoskeletal, and cognitive function, increasing the risk of conditions such as cataracts, cardiovascular disease, and neurodegenerative disorders.

From a technology perspective, the growing proportion of older adults in populations across North America, Europe, and East Asia has driven demand for engineering solutions that address functional decline while supporting independence. Wearable health monitors, fall detection systems, medication management devices, and remote patient monitoring platforms are among the technologies that gerontology has motivated.

Ambient Assisted Living Technology

Ambient assisted living (AAL) is an area of engineering research and product development focused on sensor systems, intelligent environments, and assistive devices that support older adults in their homes and daily activities. A review of ambient assisted living technologies published through the NIH identifies sensors, telemedicine platforms, assistive robotics, and smart home systems as the principal technology categories, noting that activity recognition is a foundational capability enabling most AAL functions. Digital health technologies for aging populations documented in Nature Medicine surveys wearables and remote monitoring tools that extend clinical observation into daily living environments.

Applications

Aging as a technology topic has applications in a wide range of fields, including:

• Semiconductor reliability engineering and circuit lifetime prediction
• Power systems insulation management and condition monitoring
• Assistive robotics and smart home platforms for older adults
• Ophthalmic devices addressing age-related vision changes such as cataracts
• Energy storage system lifetime management for batteries and capacitors