Stay Sharp Senior
A Working Notebook

Neuroplasticity & the lifestyle interventions that keep a mind sharp.

The adult brain rewires itself far longer than we were once told. This is an ongoing investigation into the habits, nutrients, and emerging therapies that influence how it does so, read closely, weighed honestly, and written for the curious.

12Areas of inquiry
EvidenceWeighed, not sold
2026Updated continually

Latest

Three articles
Sleep & the Glymphatic System

The brain's overnight cleaning crew: sleep and the glymphatic system

Deep sleep is when the brain runs its waste-clearance network, flushing out the proteins tied to cognitive decline. How it works, what clogs it, and the levers that protect it after 50.

Read the article
Physical Exercise & Movement

Moving for memory: four kinds of exercise, four doors into the aging brain

Aerobic work, strength training, mind-body practice, and dual-task movement each reach the brain through different biology. What each one actually does, and a weekly plan that uses all four.

Read the article
Neuroprotective & Bioregulatory Peptides

The peptide frontier: promise, hype, and the gaps in the evidence

Cerebrolysin, Semax, Epitalon, and Dihexa are spoken of with extraordinary confidence online. A clear look at what each one is, how it is thought to work, and how thin the human evidence actually remains.

Read the article

The territory

Twelve threads
01

Physical Exercise & Movement

How aerobic, resistance, and mind-body training drive the release of BDNF and muscle-derived myokines that feed the brain.

02

Cognitive Training & Learning

What adaptive computerized tasks can and cannot do to encourage synaptogenesis and preserve white matter.

Synaptogenesis
03

Sleep & the Glymphatic System

The perivascular clearance network that flushes neurotoxic waste during slow-wave sleep, and why depth matters.

04

Nutrition & Metabolism

The glucose-to-ketone switch, intermittent fasting, and ketogenic approaches as levers on brain fuel.

Ketones · Fasting
05

Nutrients & Nootropics

A grounded look at core compounds and cholinergic precursors: Omega-3s, creatine, and citicoline.

Cholinergic support
06

Hormonal Influences

The timing hypothesis for hormone replacement therapy and the debate over its neuroprotective window.

HRT · Timing
07

Psychedelics & Consciousness

Rapid structural remodeling of neurons through TrkB receptor binding, and where therapy meets neuroscience.

TrkB · Remodeling
08

Neuromodulation

Non-invasive stimulation, tDCS, TMS, and vagus nerve stimulation, and how each nudges cortical excitability.

tDCS · TMS · VNS
09

Stress & Mindfulness

How meditation and MBSR downregulate the HPA axis to shield the hippocampus from chronic cortisol.

HPA axis
10

Social & Environmental Factors

Environmental enrichment and the underrated role of sensory preservation, including treating hearing loss.

Enrichment · Senses
11

Neuroprotective Peptides

A systematic evaluation of specialized compounds: Cerebrolysin, Semax, Epitalon, and Dihexa.

12

AI & Technology

Artificial intelligence, the Internet of Things, and wearable sensors in personalized cognitive rehabilitation.

Wearables · IoT
Why this exists
This is not a clinic and not a sales page. It is a place to follow the science with curiosity rather than fear, and to treat later life as a stretch of experimentation rather than a slow defense against decline.

Each piece here aims to separate what is well established from what is merely promising or frankly speculative. Mechanisms are explained plainly, evidence is graded honestly, and the gaps are named out loud. Nothing here is medical advice. It is one person's reading of a fast-moving field, shared in the open.