Consistency in terms need to be established. This may add to clarity.
MEN
0-1: baby
1-5: toddler
5-13: kid
13-18: teen
18-40: adult
40-50: mature adult
50-60: old fart
60-80: geezer
80+: fossil [fossil status may occur earlier due to illness or injury]
There are many sub-catagories [fogey, redneck, graybeard, etc.]
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WOMEN
0-80+: babe
women at any age may have 'biddy' status, they tend to be mature
I hope this helps the very difficult process of communicating.