It means that your tissue is dying and your getting older.
Nervous tissue would be the most responsive. For example, the eyes respond to changing light intensity, blood flow, hair orientation and lung bronchioles all respond to changing temperature. The skin (melanocytes) also respond to UV radiation over time.
tissue can either mean; tissue- as in from a body muscle tissue/ biology or tissue- as in the thing you use to wipe your nose with! or tissue -there many other types of tissue toilet paper kitchen roll-you name it- they are all types of tissue as well!
( btw i mean sneeze tissue!)
thymus
There is no age limit. The body is constantly changing.
tissue
not possible
I am becoming more serene with age.
That depends who you mean by "they"; also, what they are changing their mind about.
"Cambiando" means "changing" in English.
not changing
it mean you a man