I have been to many viewings but the first one was my grandmother when I was about 6 years old. I was a little nervous about seeing a dead body but my mother tried to force my brother, about 3 years old to kiss her in the casket- I can still hear my brother screaming over that, he was so afraid. I brought it up to him one day but he had no memory of that at all.
The worse viewing was a neighbors son, only four years old, and then ,when my husband's father died, we were the only family who had brought our children to the viewing. My husband's siblings came over to me and said their kids had never been to a viewing-some were teenagers. I think children should be at viewings for a close relative.
I know someone in his 40s by now ,who is still afraid to see a dead body. When his grandfather died, he didn't go to it, but they had to shut down the viewing anyhow. I was shocked to see what happened....two of his female relatives actually started to curse and punch each other. One was the 40 year old's mother. The fight was over money.