Age Flex

🧠 Inspiration I'm currently at a six-week pop-up village in San Francisco focused on longevity. During the first weekend’s Longevity Summit, one of the speakers, JP, discussed five biometric tests that can predict mortality. I found this fascinating because they're practical tests that anyone can do—no expensive equipment needed.

That inspired me to create an app that combines these five tests to generate a "functional age." Given the time constraints—this was only last week—I didn't have enough time to build a full app. So I decided to enter the One-Prompt App Challenge and simplify it down to just three tests.

The biggest challenge has been creating an algorithm that works and feels accurate based on performance. I've been thinking strategically about how to design something that reflects real-world data. Right now, it’s version 1.5—still being refined—but this is a simplified version using only three of the tests.

I cut it down to three tests because the others are difficult to do in a controlled environment, especially solo. I also had to modify one test that typically requires equipment. Instead of a dynamometer for grip strength, I'm using the dead hang as a proxy. This way, anyone can do it anywhere.

The idea to do all this in one prompt came to me when I woke up this morning—about five hours before the deadline. So I’ve been rushing to get it all together. Fingers crossed the prompt runs smoothly! I’ll be making a quick video and submitting everything just in time.

⚙️ What It Does Calculates your functional age using three clinically validated mortality-predicting tests. It gamifies the experience with a global leaderboard and gives actionable feedback to improve your health.

🛠️ How We Built It ChatGPT (for prompts and algorithm design)

My brain 😄

Canva (for logo/assets)

BOLT (for deployment)

🚧 Challenges We Ran Into The main challenge was building an algorithm that’s both simple and scientifically grounded. It had to feel reasonable while being doable in any environment. I reduced it to three tests for accessibility and substituted grip strength (which needs a dynamometer) with dead hang time. This made it possible to test anywhere without special equipment.

The other key challenge was I didn't have time to build the full app, (that is still in development and I only started it on Friday 27th June). When I realised that would not be feasible, this morning I woke up with the idea that I could do a stripped down version and compete in the one prompt competition and powered through to build it and submit by the 2pm deadline.

🏆 Accomplishments We're Proud Of Building the entire experience including a new name, logo / branding and full web app with revised algorithms on a Monday morning in under 4 hours.

📚 What We Learned How to think more strategically and creatively to fit an entire app into a single prompt.

🚀 What's Next for Age Flex Fully build out the app Continue refining the algorithm Position it as a universal, self-test anyone can do—not just to measure functional age, but to stay motivated and healthy

Built With

• bolt
• canva
• chatgpt