Hi. I'm not related to this family. This is probably Aaron's WWI draft card:
U.S., World War I Draft Registration Cards, 1917-1918 about Aaron Edgar Paul Loper Name: Aaron Edgar Paul Loper City: Fitchburg County: Worcester State: Massachusetts Birth Date: 29 May 1885 Race: White Age: 33 Occupation: Core-maker, Foundry Nearest Relative: Marie Rose Loper (wife), Fitchburg
Like you, I found him listed in directories as early as 1916, but that's about it.I did find a small mention, possibly of him, in a newspaper:
"Aaron Loper, of Hornellsville, visited his aunt, Mrs. Myers on Railroad street..." ~Evening Tribune (Hornell, NY), 29 Aug 1905
Hornellsville is a city in Steuben County, NY, so it is in the right area.Unfortunately, there were plenty of Myers living in Hornellsville at that time, and no 1st name for Mrs. Myers so we're back to square one.