Sit to stand test results
Although this test correlates well with longevity it doesn't imply that if you do badly in the test you will die in x amount of time. There goes my change for a sensationalist headline...
It should be interpreted that improving in the test and skills required by it will will improve your chances of living longer and with better quality.
There are important factors that might condition your performance in the test and make it so that you can't get the 10 points:
foot, knee or hip injury / pain
poor congenital hip and ankle mobility
bone structure that limits strategies of getting to the floor
Nevertheless you should still strive for a high score (>8 points). Despite your limitations the skill of getting to the floor and standing back up in a controlled and smooth fashion is crucial particularly as you get older. Striving to keep or improve it is definitely a worthy project. It will also help you identify mobility, strength or balance limitations that would be worth addressing.
Correlation VS Causation
Brito LBB, Ricardo DR, Araujo DSMS, et al. Ability to sit and rise from the floor as a predictor of all-cause mortality. European Journal of Cardiovascular Prevention, 2012; DOI: 10.1177/2047487312471759
1. Araújo CGS, Castro CLB, Franca JFC, Araújo DS. Sitting–rising test: Sex- and age-reference scores derived from 6141 adults. European Journal of Preventive Cardiology. 2020;27(8):888-890. doi:10.1177/2047487319847004