Is ACTN3 useful for Langlebigkeit?

The ACTN3 gene variant (R577X) is primarily linked to power and sprint performance. For longevity, the evidence is much weaker. Some observational studies suggest that the RR genotype ('power type') may be associated with better muscle strength and function in older age, which could indirectly support mobility and quality of life. However, the effect sizes are small, and lifestyle factors like exercise, nutrition, and overall health are far more important. There is no strong evidence that ACTN3 directly extends lifespan. Using a DNA test for this purpose is more about curiosity than clinical guidance. A genetic test alone does not replace medical advice or an active lifestyle.