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A 47-year study reveals when fitness and strength start to fade

Science News from research organizations A 47-year study reveals when fitness and strength start to fade Date: January 18, 2026 Source: Karolinska Insitutet Summary: A long-running Swedish study has followed adults for nearly five decades, uncovering when physical decline truly begins. Fitness and strength start slipping around age 35, then worsen gradually with age. The encouraging twist: adults who began exercising later still improved their physical capacity by up to 10 percent.

A 47-year Swedish study found that fitness and strength begin declining as early as age 35. The good news is that starting exercise in adulthood can still boost physical ability and slow that decline

A 47-year Swedish study found that fitness and strength begin declining as early as age 35. The good news is that starting exercise in adulthood can still boost physical ability and slow that decline

Credit: Shutterstock

Key Highlights

  • It’s a powerful reminder that staying active matters, even if you start late.
  • Share: Facebook Pinterest LinkedIN Email FULL STORY A 47-year Swedish study found that fitness and strength begin declining as early as age 35.
  • The good news is that starting exercise in adulthood can still boost physical ability and slow that decline.
  • Credit: Shutterstock A long-running Swedish study conducted at Karolinska Institutet has followed people for 47 years to examine how fitness, strength, and muscle endurance evolve during adulthood.
  • The findings show that physical performance begins to decline around age 35.
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Sources

  1. A 47-year study reveals when fitness and strength start to fade

This quick summary is automatically generated using AI based on reports from multiple news sources. The content has not been reviewed or verified by humans. For complete details, accuracy, and context, please refer to the original published articles.

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