because we want these happiness again but past can not come again
Because I realize that I am not getting those past times back. <br />
I miss the times I had when I was a child. I wish that I can turn back the clock so that I can relive the past. But, I can only move forward and create new happy days.
I tend to rember happy days as a child, flying kites, my dad pushing me on my 2 wheeled bike. Hard to remember bad times now as an adult.
It's called nostalgia. You miss the good times and don't expect any more. Example? I feel nostalgia when I see people using the English language as you have done in this post. You've mangled it.
Old happy days? Which ones?
Because maybe present days seem less fun