A older man with gray hair wearing a gray suit next to a green and yellow taxi.
A older man with gray hair wearing a gray suit.
An older man with gray hair wearing a gray suit is a repetition of the first sentence.
Sentence two follows sentence one to reiterate the importance of the man having grey hair and grey suit rather than the taxi color.
"A older man with gray hair wearing a gray suit." is the same as, "A older man with gray hair wearing a gray suit."