Flexibility — the ability of your muscles and joints to move freely through their full range — is one of those aspects of fitness that most of us take for granted until we notice it slipping away. Research consistently shows that flexibility declines with age, but the good news is that it responds remarkably well to regular, modest effort. Just five to ten minutes of stretching a day, done consistently, can meaningfully preserve and even restore range of motion. This post explains why flexibility matters so much as we get older, what the warning signs of stiffness look like, and how to build simple stretching habits into even the busiest day — without gym membership, special kit, or large blocks of time.