Inspired by Last death caused by World War I.
Even as recently as 2013, we still have had casualties from abandoned munition stockpiles and the likes from WW1. I'm wondering if there are any wars from before WW1 which caused recent casualties. As a ridiculous example or 2: a collector who was killed while cleaning their Civil War era rifle which was still loaded; or someone who falls into a trap pit dug during the American Revolution. I'm specifically talking about remnants of past wars which are still out there in the world, like boobytraps or unexploded munitions.
Is the longest period between the start of a war and their most recent casualties really 99 years? or have there been even longer periods?