@Roussette
derxa
When my brother died my very quiet introverted mother went down to our wood and howled in pain. My brother's funeral was full of people weeping whereas my old dad's was a celebration of his life. Of course people mourn their elderly parents but an untimely death is like a shock to the system
So agree. 
Very similar here. The funeral of a tragic loss is just unbearable, and heart rending.
These posts on how to 'quantify' grief are getting slightly away from the OP's question.
However, I'm not going to stop posting when I see other posters trying to minimise or use 'logic' around a loved one's death.
@derxa I do not doubt that people grieve for the loss of a short life, of a young person, or as a result of an accident, in a different way. But grief is a very unique and personal response.
But I can tell you in all honesty that when our father died in his 90s, my brother took many a long walk in the woods and howled. Likewise, I shed many a tear on my own walks in the hills, where no one witnessed my tears.
Let's not forget either that funerals are often very different according to the wishes of the dead person. My mother wants her funeral to be happy, full of joy at her life, with all mourners in bright clothes. I know I will find that hard to manage. My late father was happy to be buried in a box in the garden, with no one present, though we didn't carry that out as the future sale of their house might be an issue. :)
Let's not try to measure grief according to some artificially held stereotypical ideas of young v old, celebration of life v mourning.
Every family is different.