Adult 1 Age Factors 1 Aged 1 Aging 1 Augmentation index 1 Biomedical research 1 Blood 1 Blood Flow Velocity 1 Blood flow velocity 1 Cardiorespiratory Fitness 1 Cerebral blood flow 1 Cerebrovascular Circulation 1 Cost effectiveness 1 Early indicators Female 1 Flow velocity 1 Health 1 Hemodynamics 1 Humans 1 Magnetic Resonance Imaging 1 Magnetic resonance imaging 1 Male 1 Middle Aged 1 Pulsatility index 1 Transcranial Doppler 1 Transcranial Doppler ultrasound 1 Ultrasonics 1 Ultrasonography, Doppler, Transcranial 1 Vascular Stiffness 1 Vascular health 1