One element could be unfulfilled dreams. The old man might have always wanted to travel the world but never had the chance due to various reasons. Another is the feeling of being forgotten. Maybe in a big family, the younger generations are too busy with their own lives and neglect the old man. Also, the death of a loved one, like his beloved wife, can make his story extremely sad.
An old man lived in a small village. His son had gone to the city to seek a better life many years ago and never returned. The old man waited day after day, year after year. His house was falling apart, but he didn't care. He just hoped to see his son again. As time passed, his health deteriorated, and his heart was filled with the sadness of abandonment.
In 'the old man at the bridge story', the old man is an ordinary person whose life has been upended by war. He seems to be a bit forlorn and lost. He has his own little world back home with his animals, but now that world has been destroyed by the war. He is at the bridge, a sort of liminal space between the past and an uncertain future. He represents the countless individuals who are displaced and left in a state of confusion and despair during times of war.
There's not enough detail to know for sure who the old man is. He could be a variety of things. He might be a war veteran who has some skills or knowledge that comes into play in the story. Or perhaps he's an old family friend of one of the characters, and his presence in the story is to provide a different perspective or a connection to a past event that is related to the events in 'Equalizer 2'.
He is a character who embodies the despair and displacement brought about by war. He's an old man who has been through a lot. Maybe he had a simple life before the war, but now all he has left is the bridge where he sits. He doesn't seem to have any strength or motivation to move forward, and his presence at the bridge is like a statement about the state of so many people during war.
Once there was an old man. He used to live alone in a small, dilapidated house. His children had moved to the city long ago and rarely visited him. Every day, he would sit by the window, looking out at the empty street, waiting for someone to come. He had so many memories but no one to share them with. His only companion was an old dog that was also getting weak with age. It was a truly sad existence of loneliness and longing for family.
I'm not really sure about their exact ages. But often in such stories, the ages of the characters play a crucial role in shaping the plot and the emotions involved. Maybe the boy is a bit older or younger than the 15-year-old girl.
I don't have a definite answer. The story could have the sad boy be of any age. It could be a young child or a pre-teen. Without more context, it's impossible to know for sure.