7 Indicators of Longevity?

[OJF]

In the Strain Prevention video in TacFit Warrior, Scott Sonnon mentions Balance and Grip Strength is one of the "7 indicators of Longevity." I've searched the net a little bit, but couldn't find anything about it.
Does anyone know more about these? What they are, and how they were discovered? Would be greatly appreciated :D (Even I ain't in a hurry, got plenty of time before old age kicks in ;) )

- OJF

[Scott Sonnon]

grip strength, walking speed, chair rise time, standing balance performance, flossing, travel, regular health examinations

[hermanchauw]

Studied a bit of these in physiotherapy school. You can google them under the subject of "physiotherapy for gerontology".

[Joseph David]

Through my lens:
grip strength: the motor cortex has more region for hand dexterirty. This is for fine motor skills,tool making and opposing thumb
walking speed: autonomic nervous system balance in the firing sequence of the contralatral gait
chair raise time: balance of eccentric/concentric of the deep front line and the superfiscial front line
standing balance performance: vestibular integration during sophisticated motor movement
flossing: digestion and assimulation of nutrients starts in the mouth. Balance of friendly bacteria and bad bacteria starts in the gum health
regular health exams: catch issues before they escalate into dis ease.

[paul.fanta]

travel = energy, money, adventure and some courage.