 During his time at Michigan , Schulz also became involved in one of college football 's earliest recruiting controversies , as some suggested that he was a " ringer " recruited by Michigan coach Fielding H. Yost . Schulz was 21 years old when he enrolled at Michigan and had worked in an Indiana steel mill and reportedly played for either amateur or professional teams . Michigan was refused re @-@ entry into the Western Conference in 1908 when it insisted on playing the 25 @-@ year @-@ old Schulz for a fourth season in violation of conference eligibility rules . 
