Since some prehuman ancestor of man picked up a stick or rock millions of years ago and hit something with it with the intent to injure.
Since 1945.
The first one was detonated on July 16, 1945.
Need to specify a time period in order for this to be answered. Spain has been around for a very long time, and has seen many changes to its weapons inventory.
During which period? The British military has been around for a very long time, and has seen many changes to its standard weaponry.
how long has deforestation been around
As long as guns have been around.
how long has the london eye been around for
As long as So Random has been around.
Whatever personal weapons the crew members used. The era of the Viking long boats (around 1000 AD) was before the invention of the cannon (about 1260).
They have always been around
boner
how long have boxing been around?