Oxidative damage and mitochondrial decay in aging: A review Oxidative damage is a critical factor in mitochondrial dysfunction associated with aging. Mitochondria generate oxidants that contribute to oxidative lesions accumulating with age. Several mitochondrial functions decline with age, including proton leakage, membrane fluidity, and cardiolipin levels. Acetyl-L-carnitine (ALCAR) improves mitochondrial function by increasing ATP production. Oxidative damage to mitochondrial DNA, proteins, and lipids increases with age, leading to mutations, dysfunctional proteins, and lipid peroxidation. These changes contribute to age-related diseases such as neurodegeneration, cancer, and cardiovascular disease. Mitochondrial DNA (mtDNA) is more susceptible to oxidative damage than nuclear DNA, with higher mutation rates and damage levels in postmitotic tissues. Oxidative damage to mtDNA leads to dysfunctional mitochondria and neurodegenerative diseases. Oxidative damage to mitochondrial proteins and lipids also contributes to mitochondrial dysfunction, reduced energy production, and increased oxidant production. Cardiolipin, a key mitochondrial lipid, is more susceptible to oxidation and its decline with age is associated with reduced mitochondrial function. Mitochondrial dysfunction is linked to age-related changes in bioenergetics, including decreased activity of electron transport chain complexes and reduced ATP production. These changes are associated with increased oxidative damage and mitochondrial dysfunction. Species-specific differences in longevity correlate inversely with metabolic rate, with longer-lived species having lower metabolic rates and less mitochondrial oxidant production. Mitochondrial DNA mutations and deletions are associated with age-related deficits in mitochondrial function. These mutations can lead to myopathies and increased susceptibility to neurodegenerative disorders. Oxidative stress and mitochondrial dysfunction contribute to age-related declines in mitochondrial function and energy production. ALCAR improves mitochondrial function by increasing cardiolipin levels and ATP production. It also reduces lipofuscin accumulation and improves cognitive and motor functions in aged animals. Calorie restriction also improves mitochondrial function and reduces oxidant production. Neuronal and neuroendocrine aging are associated with mitochondrial dysfunction, leading to increased neuronal loss and age-related cognitive decline. Oxidative damage to neurons and mitochondrial dysfunction contribute to neurodegenerative diseases such as Alzheimer's and Parkinson's. Mitochondrial dysfunction also contributes to immune system decay, with age-related deficits in T-cell function and cell-mediated immunity. Dietary antioxidants and ALCAR improve mitochondrial function and immune response in aged individuals. In summary, oxidative damage and mitochondrial dysfunction are major contributors to aging and age-related diseases. Mitochondrial dysfunction leads to reduced energy production, increased oxidant production, and cellular damage. ALCAR and calorie restriction can improve mitochondrial function and reduce age-related deficits.Oxidative damage and mitochondrial decay in aging: A review Oxidative damage is a critical factor in mitochondrial dysfunction associated with aging. Mitochondria generate oxidants that contribute to oxidative lesions accumulating with age. Several mitochondrial functions decline with age, including proton leakage, membrane fluidity, and cardiolipin levels. Acetyl-L-carnitine (ALCAR) improves mitochondrial function by increasing ATP production. Oxidative damage to mitochondrial DNA, proteins, and lipids increases with age, leading to mutations, dysfunctional proteins, and lipid peroxidation. These changes contribute to age-related diseases such as neurodegeneration, cancer, and cardiovascular disease. Mitochondrial DNA (mtDNA) is more susceptible to oxidative damage than nuclear DNA, with higher mutation rates and damage levels in postmitotic tissues. Oxidative damage to mtDNA leads to dysfunctional mitochondria and neurodegenerative diseases. Oxidative damage to mitochondrial proteins and lipids also contributes to mitochondrial dysfunction, reduced energy production, and increased oxidant production. Cardiolipin, a key mitochondrial lipid, is more susceptible to oxidation and its decline with age is associated with reduced mitochondrial function. Mitochondrial dysfunction is linked to age-related changes in bioenergetics, including decreased activity of electron transport chain complexes and reduced ATP production. These changes are associated with increased oxidative damage and mitochondrial dysfunction. Species-specific differences in longevity correlate inversely with metabolic rate, with longer-lived species having lower metabolic rates and less mitochondrial oxidant production. Mitochondrial DNA mutations and deletions are associated with age-related deficits in mitochondrial function. These mutations can lead to myopathies and increased susceptibility to neurodegenerative disorders. Oxidative stress and mitochondrial dysfunction contribute to age-related declines in mitochondrial function and energy production. ALCAR improves mitochondrial function by increasing cardiolipin levels and ATP production. It also reduces lipofuscin accumulation and improves cognitive and motor functions in aged animals. Calorie restriction also improves mitochondrial function and reduces oxidant production. Neuronal and neuroendocrine aging are associated with mitochondrial dysfunction, leading to increased neuronal loss and age-related cognitive decline. Oxidative damage to neurons and mitochondrial dysfunction contribute to neurodegenerative diseases such as Alzheimer's and Parkinson's. Mitochondrial dysfunction also contributes to immune system decay, with age-related deficits in T-cell function and cell-mediated immunity. Dietary antioxidants and ALCAR improve mitochondrial function and immune response in aged individuals. In summary, oxidative damage and mitochondrial dysfunction are major contributors to aging and age-related diseases. Mitochondrial dysfunction leads to reduced energy production, increased oxidant production, and cellular damage. ALCAR and calorie restriction can improve mitochondrial function and reduce age-related deficits.