Studies indicate that the number of elderly people will double worldwide by 2050. When we talk about aging, we usually think of wrinkles, joint stiffness, declining fitness, among other bodily symptoms—but what about the brain? Does it age as the body? This article presents the scientific concept of neurological aging; how neurons change with age and why the biological age of the brain differs from one person to another. It also examines the role of lifestyle in slowing cognitive decline.
Does the brain age?
Yes, the brain ages biologically, but not in the same way the body does; it is less mechanical and more influenced by life experiences and daily habits. While we clearly see the signs of an aging body, the brain ages in silence. The total brain volume begins to shrink gradually as we reach our thirties or forties, and the pace accelerates after the age of sixty.
What is interesting is that this shrinkage does not occur in all areas to the same degree; the areas responsible for complex thinking—such as the prefrontal cortex—and memory—such as the hippocampus—are the most affected. It is good to know that the brain does not lose its neurons in massive numbers during normal aging; instead, the connections between neurons become less efficient or shrinks slightly.
Neuroscientists also use a concept known as "the brain's biological age", which measures the extent of changes in the brain's structure and functionality using imaging tools, such as Magnetic Resonance Imaging (MRI). Research has shown that the brain can look older or younger than our chronological age, depending on lifestyle factors, such as sleep, nutrition, and physical activity.
To understand how the brain ages, imagine your brain as a big city filled with power grids and message networks in which the following occur:
- Decline of the white matter, which is the "wiring" of the brain; as we age, the speed at which messages travel through it slows down, making us slightly slower at processing new information.
- Neurotransmitters are chemical messengers; as we age, the production of substances as dopamine (reward and happiness hormone) and serotonin (mood-regulating hormone) decreases. This may, in turn, affect the speed of our movement or even our emotional state.
How to keep your brain young and strong?
- Sports: when you work out, your brain secretes the BDNF protein, which acts as a "fertilizer" that helps grow new neurons and strengthen the connections between them. Focus, thus, on activities that you enjoy, such as brisk walking, running, or cycling, for 150 minutes a week.
- Diet: food is not only for the body but for the brain as well; for example, the MIND diet focuses on neuroprotective foods, including:
- Berries and strawberries improve communication among cells.
- Leafy greens (such as spinach) are rich in vitamins that protect the brain.
- Nuts and fish provide healthy fats that build cell membranes.
- Reduced sweets and fried foods, because they increase inflammation.
- Mental Challenges: The brain acts as a muscle; if you do not train it, it weakens. Learn a new language, play strategy games, or learn to play a musical instrument. These activities build "neuroplasticity" and make your brain capable of reorganizing itself.
- Sleep: while sleeping, your brain activates a special system to remove toxins and harmful proteins that have accumulated during the day; ensure you get 7–9 hours of quality sleep daily.
- Friendships and Community: social isolation affects the brain; spending quality time with friends and family stimulates areas of memory and social intelligence, and reduces stress hormones that damage neurons.
- Head Protection: head injuries can have a long-term impact on thinking and memory; always make sure to wear a helmet when riding a bike or practicing dangerous sports, and use your car seatbelt.
Always remember that what you do today in your youth determines the shape of your future; aging is not just a number, but rather the result of our daily habits. By practicing healthy habits, you can keep your brain younger and more vibrant, no matter how old you get.
References
brainfacts.org
gethealthspan.com
kendalathome.org
mayo.edu
mayoclinic.org
mdpi.com
mri-wellness.com
nia.nih.gov(1)
nia.nih.gov(2)
tcd.ie
Image by Magnific