Chronological age represents the time elapsed since birth, whereas biological age provides an assessment of physiological function and overall health status relative to individuals of the same chronological age. In other words chronological age counts the years you've lived, while biological age reveals how your body's health compares to that timeline.

If you ask from google “what is the world record of reducing one's biological age”?

A name Bryan Johnson¹ who was born in 1977, which makes his chronological age 47 in 2024; popped at every platform, claiming Bryan Johnson’s biological age is typically not a single figure but a specific age allocated to each monitored organ or bodily function compared to the average metrics for a sample population. According to his markers reported over the years, he has:

1. The heart of a 37-year-old
2. The skin of a 28-year-old
3. The lungs and fitness of an 18-year-old
4. Kidney arteries of a 25-year-old
5. Thyroid volume of a 23-year-old
6. Prostate volume of a 30-year-old.

And all this propaganda to allure the public to an intense anti-aging regimen — his publicly available Blueprint that he has reduced his biological age by at least five years so far.

Now contrast this with the biological age of Ajay Saxena²;

as depicted in the above picture:
This individual, born in 1966, demonstrates a chronological age of 58 years. However, based on the above image, his biological age is estimated significantly younger, as 25 years old.
The achievement:
He drafted his will3 over a decade ago. However, the significant health improvements I'm referring to have occurred within the past eight years to him.
During this period, he has successfully mitigated the biological burden accumulated from 28 years of intense sedentary lifestyle. Prior to this, he spent over 14 hours daily sitting, commencing on October 20, 1988, without any breaks. This prolonged sedentary period, coupled with a demanding work schedule [approximately twice the daily workload of average service professionals and 1.5 times the annual workload considering typical workdays consist of only 67% of 365 days a year*; has significantly impacted his overall health.
Based on these factors, he estimated the accumulated biological burden on his body to be equivalent to that of a 114-year-old individual (calculated as: 28 years of intensive work x 3 = 84 years + 22 years of childhood + 8 years of post 50 lifestyle).
Through dedicated efforts in the past eight years, he has effectively reversed the effects of this significant biological burden, achieving a reduction of over 33 years.

The challenging environment and its effects:

This is a testament to resilience and the power of holistic approaches. Despite facing a series of significant health challenges by him, including 
Tuberculosis 
contracted in a poorly ventilated environment, 
Fistula
resulting from prolonged sedentary lifestyle, 
Diverticulitis, 
thanks to the greedy behavior in early twenties
Herniated discs, 
thanks to the egoistic, feet over the top of the table behavior in entire forties

Pancreatic cancer, 
thanks to the overeating of dry fruits in the corona era, in the mid fifties and numerous 
Musculoskeletal injuries 
(dozens of stress fractures, sprains, tendonitis), thanks to overburdened them in greed;
recovery was achieved through utilizing kitchen ingredients. 
This journey of healing has spanned over the past 28 years, culminating in successful navigation of the COVID-19 pandemic without vaccination⁴, while residing in a densely populated metropolitan area with the highest reported mortality rate in the country.
*[about 245 {104 weekly off + 13 Casual Leaves + 4 national and state holidays + 5 local holidays like festivals/ jayanti/ punyatithi/ curfew / bund/ strike/ election etc) forget unofficial picnic/parties etc}].

The opportunity:

1. India's decline in global standing, as measured by the Human Development Index (HDI), is a cause for deep concern. Despite significant investments in infrastructure – roads, bridges, dams, numerous universities and colleges, and a vast pool of highly educated individuals – the nation has slipped from a top-tier position to 134th, trailing behind smaller nations.
2. This decline is compounded by a pervasive sense of complacency.
3. A common response to the question 'How are you?' is a dismissive 'Theek' (fine), reflecting a lack of genuine introspection and a collective unwillingness to address the root causes of this national malaise.
4. The devaluation of the Indian Rupee, from ₹0.1 to ₹86 against the US Dollar over the past 100 years, has significantly contributed to this decline.
5. This economic instability has driven a brain drain, with our brightest minds seeking opportunities abroad.
6. This situation demands urgent action. We need a collective commitment to reverse this trend and reclaim India's rightful place on the global stage.
7. This mission⁵ requires the active participation of the best and brightest minds, and we offer competitive compensation to those who are willing to join⁶ this critical endeavor.

Why

Why he started investing his daily 8 hours in this mission, you can find here. 

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Key terms:

Longevity: survival to an old age
Lifespan: total years lived
Healthspan: years lived in good health
Chronological age: the number of years you have been alive
Biological age: how old your cells appear to be based on their current condition
Longevity simply means that you live to a nice old age. However, it defeats the purpose of living longer if those years are spent sick and in pain.
When you increase your longevity, it’s also important to focus on ways to increase your healthspan, so that you maximize your quality of life.
We now have very effective ways to monitor the speed that our bodies age throughout our lives so that we can make changes to our diet and lifestyle that quite literally turn back the hands of time.

What Is the goal of calculating your Biological Age?

The goal of calculating your biological age is to measure the speed at which your body is aging so that you can determine how your current diet and lifestyle choices are impacting healthy aging.
Your biological age indicates how much aging and damage has occurred inside your body over the course of your lifetime. The biological age calculations are accurate predictors of your healthspan and lifespan.
It might sound obvious, but aging is the leading risk factor for disease. 
And while you can’t do anything about the number of years you’ve lived on this planet, you can improve your biological age (reduce the damage in your cells) over time by making changes to your diet and lifestyle.
Ideally, your biological age would end up being lower than your actual age (though it’s still a great sign if the two numbers just match). 
If the numbers match, it means that your body is aging appropriately. If your biological age is less than your actual age, it means that your body is aging more slowly than what is typical for your age. 
If your biological age is higher than your actual age, it may mean that there’s been a lot of damage to your cells and your body is aging more rapidly than someone of your actual age.