I was walking down the street and a gray-haired older man started talking to me.
I was walking along the street the other day when an older gentlemen with gray hair struck up a conversation with me.
この場合、次のような言い方ができます。
ーI was walking down the street and a gray-haired older man started talking to me.
「道を歩いていたら、白髪のおじさんが話しかけてきた」
a gray-haired older man「白髪のおじさん」
to start talking to ...「…に話しかける」
ーI was walking along the street the other day when an older gentlemen with gray hair struck up a conversation with me.
「この前道を歩いていたら、白髪の年配の紳士が話しかけてきた」
an older gentlemen with gray hair「年配の白髪の紳士」
to strike up a conversation with ...「…に話しかける」
ご参考まで！
As I was walking, a guy with white hair approached me.
"道を歩いてたら白髪のおじさんが話しかけてきたんだ"
- As I was walking, a guy with white hair approached me.
- I was just walking down the street when an old man with white hair began speaking to me.
- This white-haired guy started talking to me when I was walking.
カナダ 
アメリカ合衆国 
