I guess if you survived the Somme you're hard to kill
Queen Elizabeth meets with Britain's three surviving WWI vets. The oldest is 106, which means that (like the U.S.'s longest surviving Civil War vets) he was more than a bit underage when he enlisted (as in 14-15 at the Somme).
Understand, this fellow was born in the first year of the reign of Edward VII. In American terms, he was born the year after President McKinley was assassinated, and Teddy Roosevelt took over.