During the last several years, brian, who is now 87 years old, has experienced a decline in his hearing and vision. he also has increasing difficulty walking up stairs and lifting things. according to the text, brian is in the period of life.

Senescence refers to a common cellular procedure which happens due to the anxiety, stress or any kind of damage. It shapes an elective reaction of cells to harm that may somehow cause customized cell expiration. ... Some senescent cells continue in tissues, sometimes expanding in recurrence as an element of age.

dude you should crop your image so only the question shows. but   can you explain it better

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.