In the 1900 United States Census, Todd Elliott is listed as a boarder at the age of 18. The head of the household is Anna M. Long and there are 22 other boarders living there.
The address is ED 38 Precinct 2 Allegheny city Ward 4, Allegheny, PA. It's unlikely that Todd would be in an earlier census as almost all of the 1890 US Census was destroyed in a fire and Todd was not born until Jan 1882, so he could not be in the 1880 US Census.