Aah...the "What if" question....
What if I had chosen that, instead of this...
What if I had followed my heart...or not followed..
We will never know.
So, maybe the older man you see walking by himself - next to the lamp post - is thinking exactly that..."What if" ...
And perhaps, just perhaps this old man and the younger man walking next to the woman in the red dress are the same ....The same man.
Perhaps, there is no couple walking...perhaps is just the old man's imagination.
Imagining "What if" ....he had followed his heart.