"Age category","Grant stage","Halstead stage","Maltby stage","Higham age"
"neonate","0-2","A","1","<3 weeks"
"juvenile","3-16","B-C","2-3","1-18 months"
"subadult","17-37","D-E","4-5","18-40 months"
"young adult","38-42","F","6",">40 months"
"adult",">43","G","7",">40 months"
"old adult",">43","H-I","7",">40 months"