Ch. 17

Late adulthood is generally conceptualized as the period beginning from approximately 65 years of age until death.
- Some definitions specify starting from 60 years, indicating variability in the understanding of the onset of late adulthood.

Late adulthood can be broken down into three subgroups:
1. Young old: 65-74 years
2. Old old: 75-84 years
3. Oldest old: 85 years and above
- The oldest old subgroup includes centenarians (age 100+) which is a rapidly growing segment within the population.

The 65 and older demographic is experiencing rapid growth, particularly in Canada, influenced by advancements in medicine and technology leading to increased life expectancy.
This growth results in logistical challenges due to the increasing need for elder care outpacing the available caregivers from younger adult populations.

Gerontology: The scientific study of aging and issues related to it.
Geropsychology: A sub-field in psychology that addresses the psychological and behavioral aspects specifically related to aging.
- Specialists in geropsychology at the department include Dr. Thomas Hadjestar Rolfoes and Dr. Natasha Galantz, with the latter holding a Canada Research Chair in Aging and Long Term Care.
The demand for geropsychologists currently exceeds the available supply, reflecting the urgent need for specialists as society ages.

Historically, aging was viewed predominantly as a period of decline and loss.
- Recent insights highlight late adulthood as a time with considerable individual variability, where many experience continued health and enthusiasm for life.
Aging should not be seen solely as a negative experience for everyone, as variations exist.

The maximum life span is estimated at around 120 years, but very few reach this age.
The rate of death increases significantly post-65 years, with risks of dying approximately doubling every eight years until age 80, at which point the odds plateau around 105 years.
- Sex Differences in Longevity:
- Females generally live longer than males due to a lower incidence of diseases like cancer and cardiovascular issues, which contribute to male mortality.

Longevity is estimated to be 20-30% heritable; however, researchers suggest that the heritability factor may be significantly lower (around 10%) when considering elements like assertive mating.
- Assertive mating: Individuals with similar traits (values, behaviors) tend to pair, potentially impacting lifespan due to shared lifestyle choices rather than genetics.

Senescence: Defined as the natural, gradual deterioration of body systems post-maturity; it is caused by genetic and environmental interactions, including stochastic factors (random/unpredictable elements).
- Although aging is not a disease, it increases vulnerability to various diseases.
Hayflick Limit: Proposed by Leonard Hayflick, this theory suggests that human cells can only replicate a limited number of times before they lose the ability to replicate accurately, marking an inevitable decline in cellular function.
Telomeres: Strings of repetitive DNA at the ends of chromosomes that shorten with each cell division; when they become critically short, it leads to cell aging and death. Environmental stressors can further impact telomere length. The enzyme telomerase can restore telomeres in some cells.

Aging and cell damage can accumulate due to:
- DNA strand breaks from metabolic processes.
- Cross-linking: Formation of undesirable bonds between molecules that leads to loss of cellular function (e.g., wrinkles).
- Free radicals contribute to cellular damage from various environmental exposures, including air pollution and metabolic byproducts.

Many seniors report their health as good or excellent despite some age-related declines.
The likelihood of self-rating health as poor increases from 6% in early adulthood to 21% for those aged 65 and older.
Health is a significant predictor of physical and mental trajectories in this age group.

Functional status: Refers to an individual's ability to perform self-care and daily living tasks.
- Divided into:
1. Basic Activities of Daily Living (BADLs): Self-care tasks (e.g., bathing, dressing).
2. Instrumental Activities of Daily Living (IADLs): More complex tasks (e.g., cooking, money management).
Over 70% of Canadians aged 60-79 and 82% over 80 report at least one chronic health condition.

Secondary aging factors, including obesity and chronic conditions like hypertension, significantly impact the performance of daily living activities.
Disabilities in older adults: Approximately 71% of Canadians aged 60-79 and 82% of those aged 80+ have at least one chronic condition.

Poor health status, social isolation, and lack of support contribute to higher rates of depression, anxiety, and overall morbidity in older adults.
Gender differences exist, with women experiencing more chronic health conditions yet living longer, while men have shorter life expectancy generally.

Dementia: Characterized by declines in memory and cognitive functioning, impacting emotional and physical health. Approximately 1/3 of seniors will have some form of dementia; it can complicate care and contributes to increased risk of institutionalization.
- Typical symptoms: memory loss, confabulation, poor concentration, and behavioral changes.
Alzheimer's Disease: One of the most well-known forms of dementia, marked by a gradual onset starting with memory difficulties and leading to severe cognitive decline.
- Diagnosis requires post-mortem examination of neural tissue for neurofibrillary tangles and plaques.
Anxiety Disorders: Affect approximately 17% of older adults, with anxious individuals experiencing worries related to health, mortality, and cognitive decline.
Depression: Often correlates with health issues, loss, and caregiving roles.
- Diagnosing depression in seniors can be complicated due to atypical symptom presentations, often manifesting as physical complaints rather than psychological ones.

Mental health and cognitive decline in older adults necessitate specific considerations due to unique presentations and risk factors.
- Geropsychologists play a crucial role in identifying, diagnosing, and treating mental health issues in seniors.
Supporting the emotional and psychological needs of older adults is vital for enhancing well-being and quality of life.
The intersection of health status, social support, and mental functioning is critical for promoting resilience and effective coping strategies among older adults, informing approaches in geriatric care and community support initiatives.