I really doubt it's the cowashing. I would guess it is due to hormonal changes or simply getting older. My hair started thinning in my late 20's, early 30's. and I wasn't CG. your hair and skin changes throughout your life.
2C/ Coarse/ Normal porosity/ SW Florida/ Salt & Pepper
Cleanse: AIA cowash, TJ Tea Tree Condish
Condish: JC Too Shea, Tresemme Botanique
Stylers: flax/okra gel or KCCC + CJ PP or JC Spiralicious
Experimenting with Got2B Ultra gel and loving it so far!