Is neuroplasticity maintained throughout the entire lifespan?

Does neuroplasticity decline with age, and can it be restored?

Neuroplasticity does not vanish in old age, but its expression becomes more limited and requires specific conditions. A 2024 study in mice found that high-frequency stimulation of the thalamocortical pathway induced long-term potentiation (LTP, a cellular basis of learning) in young adult mice, but this LTP could not be elicited in juvenile (3-week-old) or aged mice (over 18 months old) [2]. The failure in aged mice was due to an inability to release the neuropeptide cholecystokinin (CCK) in the auditory cortex. Crucially, when CCK was administered directly into the auditory cortex of aged mice, LTP was rescued and frequency discrimination improved significantly [2]. This demonstrates that the machinery for plasticity remains present in the aged brain and can be reactivated.

Another study in 20-month-old mice (equivalent to late middle age in humans) confirmed memory and plasticity deficits, but these could be reversed by manipulating perineuronal nets (PNNs), which are structures that stabilize synapses [4]. Specifically, restoring chondroitin 6-sulphate (C6S) levels in aged animals rescued memory deficits and restored cortical LTP [4]. In contrast, transgenic mice lacking the enzyme to produce C6S showed early memory loss at just 11 weeks old, mimicking an aged brain [4]. This suggests that age-related plasticity decline is partly due to molecular changes in the extracellular matrix, not an irreversible loss of plasticity.

How do hormones and environment affect plasticity across life?

Hormones play a double-edged role in regulating neuroplasticity throughout life. Testosterone, for example, influences neuroregenerative and function-restoring processes, but its levels decline with age, stress, and medical treatments [1]. The review notes that testosterone replacement therapy (TRT) is more beneficial in young individuals with testosterone deficit and specific subgroups with cognitive dysfunction, but its benefits in aging men are debated [1]. This indicates that hormonal status modulates plasticity differently at different life stages.

Environmental factors also shape plasticity from before birth to late adulthood. A 2025 systematic review of 23 studies found that exposure to green environments (forests, residential greenness within 300–500 meters of home) is associated with positive, region-specific brain changes across the lifespan [3]. Notably, no studies examined green architecture or biophilic interiors, suggesting that the type and proximity of green space matter [3]. This implies that lifestyle interventions can support plasticity even in older age.

Hormones also mediate adaptive neuroplasticity during major life transitions, such as puberty, motherhood, and fatherhood [5]. For example, the transition to motherhood involves significant hormonal fluctuations that enact neuroplastic changes to prepare for novel cognitive and emotional demands [5]. These changes can have long-term protective effects on brain health in mid-life and beyond [5].

Can lifestyle interventions maintain or enhance plasticity in older age?

Yes, non-invasive lifestyle interventions can promote neuroplasticity and mitigate age-related cognitive decline. A 2023 review highlights that regular physical exercise, meditation, and learning can enhance brain plasticity and support psychological resilience [6][8]. These interventions work by reducing neuroinflammation, oxidative stress, and protein aggregation—common mechanisms in aging and neurodegeneration [8]. The review emphasizes that neuroplasticity is a dynamic process that persists throughout life, and individuals can collaborate with their brain's adaptive capacity to cope with challenges [6].

Cutting-edge technologies like brain-computer interfaces (BCIs) and targeted neuromodulation are also being explored to harness plasticity, though widespread clinical adoption faces methodological limitations and ethical concerns [7]. The key takeaway is that plasticity is not a fixed trait but a capacity that can be influenced by behavior and environment at any age.

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