Baby:0 months-1 year Toddler:2-4 years Child:5-9 Preteen:10-12 Young teen:13-14 Teen:15-19 Young adult:20-25 Adult:26-40 Young middle age:41-49 Middle age:50-64 Elder:65+
Actually it’s this in years Baby:0-2 Toddler:3-5 Child:6-9 Tween:10-14 Teen:15-19 Young adult:20-24 Adult:25-39 Young middle age:40-49 Middle age:50-64 Elderly:65+