The Longevity Calculator is designed to provide a *speculative estimate* of your remaining lifespan based on several key factors. It's crucial to understand that this tool is for informational and entertainment purposes only. It cannot predict your exact lifespan, as countless variables, including unforeseen events, significantly influence longevity.
The calculation uses a simplified model to adjust a baseline life expectancy by considering lifestyle choices, genetics, and environmental factors.
How the Calculation Works:
The core of the calculation starts with your provided Estimated Life Expectancy. This is then adjusted based on several inputs:
Current Age: This determines how many years you have already lived. The remaining years are calculated by subtracting your current age from your estimated life expectancy.
Healthy Habits Score (0-10): A higher score, indicating better diet, sleep, and avoidance of harmful substances, generally contributes to a longer lifespan. This score can add or subtract potential years. A score of 10 might add up to 3 years, while a score of 0 could subtract up to 5 years.
Genetics Factor (0-10): Genetics play a significant role. A higher score (closer to 10) suggests a family history that supports longevity, potentially adding years. A lower score might indicate a predisposition to certain conditions, subtracting potential years. A score of 10 might add up to 2 years, while a score of 0 could subtract up to 4 years.
Average Daily Stress Level (1-10): Chronic high stress is linked to various health problems. Higher stress levels can negatively impact lifespan. A stress level of 1 might add up to 1 year, while a level of 10 could subtract up to 3 years.
Weekly Exercise Sessions (0-7): Regular physical activity is a cornerstone of good health. More frequent exercise generally contributes to a longer, healthier life. Each session above 2 per week might add a fraction of a year, up to a maximum of 2 years for consistent activity.
The formula attempts to quantify these influences to provide a modified lifespan.
Formulaic Approach (Simplified):
The calculation can be broadly represented as:
Estimated Remaining Years = (Base Life Expectancy - Current Age) + (Healthy Habits Adjustment) + (Genetics Adjustment) + (Stress Adjustment) + (Exercise Adjustment)
Where the adjustments are non-linear and capped to avoid extreme results. For example:
Healthy Habits Adjustment: (Score – 5) * 0.5 years (capped between -5 and +3 years)
Genetics Adjustment: (Score – 5) * 0.4 years (capped between -4 and +2 years)
Stress Adjustment: (5 – Score) * 0.5 years (capped between -3 and +1 year)
Exercise Adjustment: MAX(0, Score – 2) * 0.2 years (capped at +2 years)
These values are illustrative and the actual JavaScript implementation refines these by ensuring the final projected age remains non-negative.
Factors Not Included:
This calculator does not account for:
Environmental factors (pollution, access to healthcare)
Accidents or sudden illnesses
Specific medical conditions or family history details
Socioeconomic status
Personal choices not covered by "healthy habits" (e.g., risky behaviors)
Use this calculator as a starting point for reflection on your lifestyle choices and their potential impact on your well-being. Consult with healthcare professionals for personalized health advice.
function calculateLongevity() {
var currentAge = parseFloat(document.getElementById("currentAge").value);
var lifeExpectancy = parseFloat(document.getElementById("lifeExpectancy").value);
var healthyHabitsScore = parseFloat(document.getElementById("healthyHabitsScore").value);
var geneticsFactor = parseFloat(document.getElementById("geneticsFactor").value);
var stressLevel = parseFloat(document.getElementById("stressLevel").value);
var exerciseFrequency = parseFloat(document.getElementById("exerciseFrequency").value);
var resultElement = document.getElementById("result");
var resultsSection = document.querySelector(".results-section");
// Input validation
if (isNaN(currentAge) || isNaN(lifeExpectancy) || isNaN(healthyHabitsScore) || isNaN(geneticsFactor) || isNaN(stressLevel) || isNaN(exerciseFrequency)) {
resultElement.textContent = "Please enter valid numbers.";
resultsSection.style.display = "block";
return;
}
if (currentAge < 0 || lifeExpectancy <= 0 || healthyHabitsScore 10 || geneticsFactor 10 || stressLevel 10 || exerciseFrequency 7) {
resultElement.textContent = "Please check input ranges.";
resultsSection.style.display = "block";
return;
}
// — Calculation Logic —
var baseRemainingYears = lifeExpectancy – currentAge;
var adjustment = 0;
// Healthy Habits Adjustment
var healthyHabitsAdjustment = (healthyHabitsScore – 5) * 0.6; // Scale factor: 0.6 years per point difference from average
if (healthyHabitsScore > 10) healthyHabitsAdjustment = (10 – 5) * 0.6; // Cap at score 10
if (healthyHabitsScore 10) geneticsAdjustment = (10 – 5) * 0.4; // Cap at score 10
if (geneticsFactor < 0) geneticsAdjustment = (0 – 5) * 0.4; // Cap at score 0
geneticsAdjustment = Math.max(-4, Math.min(2, geneticsAdjustment)); // Cap between -4 and +2 years
adjustment += geneticsAdjustment;
// Stress Level Adjustment
var stressAdjustment = (5 – stressLevel) * 0.5; // Scale factor: 0.5 years gained for each point below 5
if (stressLevel 10) stressAdjustment = (5 – 10) * 0.5; // Cap at stress level 10
stressAdjustment = Math.max(-3, Math.min(1, stressAdjustment)); // Cap between -3 and +1 year
adjustment += stressAdjustment;
// Exercise Frequency Adjustment
var exerciseAdjustment = Math.max(0, exerciseFrequency – 2) * 0.3; // 0.3 years per session above 2, starting from 3 sessions
if (exerciseFrequency > 7) exerciseAdjustment = Math.max(0, 7 – 2) * 0.3; // Cap at 7 sessions
exerciseAdjustment = Math.min(2, exerciseAdjustment); // Cap at +2 years
adjustment += exerciseAdjustment;
var finalRemainingYears = baseRemainingYears + adjustment;
// Ensure remaining years is not negative
if (finalRemainingYears < 0) {
finalRemainingYears = 0;
}
resultElement.textContent = Math.round(finalRemainingYears) + " years";
resultsSection.style.display = "block";
}