"Age category","Grant stage","Payne stage","Maltby stage","Payne Age"
"neonate","0-1","A","1","0-2 months"
"juvenile","2-17","B-C","2-3","2-12 months"
"subadult","18-28","D","4","1-2 years"
"young adult","29-39","E-F","5-6","2-4 years"
"adult",">40","G","7","4-6 years"
"old adult",">40","H-I","7","6-10 years"