Rasarnavasudhakara 1.278

1.278

atha caturtha-yauvanam-
jarjaratvaṃ stana-śroṇi-gaṇḍoru-jaghanādiṣu |
nirmāṃsatā ca bhavati caturthe yauvane striyāḥ ||

Now, the fourth youth:
Worn-out condition in breasts, hips, cheeks, thighs, and loins,
and fleshlessness occur in a woman's fourth youth;