Old Man

Why does an old man need a blood vessel dilator?
I thank the answers but I need biological level answers.
My question is, why does an old man need a blood vessel dilator?
What is the matter with his body, organism, blood, etc?
What is going on with his chemistry or biology of his body?
I hope that somebody knows it.
check out vasodilator at wikipedia.org that explains it
Neil Young OLD MAN
Classic Books Library