Never worn it except for very occasional use of mascara and eye liner when I went out in my 20s and early 30s. I am now in my 50s.
I was never really into it for a variety of reasons:
My mother did not wear it
I am very cack handed and have no eye for detail so I could never apply it properly
I have never thought of myself as pretty or beautiful and when I did wear it, I didn't feel it enhanced my looks, just drew attention to how unattractive I am
I obviously don't leave my face alone as whenever I wore any, within 2 minutes I would absent mindedly rub my face and smudge it
I am too lazy to spend the time applying it and reapplying it
I prefer to be valued for my intellect and personality than for how I look.
I suppose I would agree with the idea that I don't care that much about my appearance. Of course, I do care, I wash myself, and brush my hair (though often only once a day!) and I wear clothes I feel good in, I don't just bung on anything, but I don't care enough to wear make up.