An important finger prick has arrived. Experts on aging, nutrition and exercise physiology have developed a blood test that claims to assess your physiological age based on your hormones, allowing you to adjust diet, exercise and lifestyle accordingly in hopes to stay young.

The service, called InnerAge, launched this week in Cambridge, Massachusetts after two years of development.

The team's research concludes that five hormones are the biomarkers most scientifically proven to reflect your physiological age vis-à-vis your chronological age.

Assessing your levels of glucose, vitamin D, inflammation indicator hsCRP, liver damage indicator ALT and, for men, testosterone provides information that the service claims can be used to shave up to 15 years off your real age.

"The advice is tailored to your body, and might include guidance like eating avocados, beans, and artichokes to reduce glucose, and eating more salmon, cheese, and mushrooms to increase levels of vitamin D," says Dr. Gil Blander, who founded InnerAge based on his postdoctoral research on aging at the Massachusetts Institute of Technology.

Advice is accessible by means of the company's website and corresponding app.

They can also provide early warning signs that could negatively impact longevity, according to parent company InsideTracker.

This anti-aging blood test costs $99 USD.