There are two people, one verified and one not verified, who are the last remaining veterans of World War I. They are Florence Green of the UK who served in the Women's Royal Air Force, and Andrew Rasch, who claims to have been in the US Navy. Both of them are 110 years old.
An uncle by marriage lied about his age and joined the Navy, and he eventually fought at Iwo Jima. He passed away recently, having been going through the stages of Alzheimer's Disease, the "long goodbye." I wrote about him here and here. He died less than three weeks after I wrote that first link and I spent the last part of my summer arranging the funeral.
Nursing homes are full of veterans. Go visit one. Not today, but tomorrow or the next day, when most everyone else will have forgotten them until next year.