In Roman Britain, you would be lucky to live beyond 40. Many babies died very young and a large number of people did not survive childhood.
People were buried by the roads outside of towns because it was not allowed to bury the dead where people were still living. A tombstone might mark the grave. Burials often contained personal objects to take to the next world and a coin. The coin was so that the dead person could pay the ferryman to take them across the river Styx to the Underworld.