Daguerreotype Older woman in mourning dress?

Is this a widow? Her dress may betray her, older women may have reached a fashion cul-de-sac; could the dress be thirty years old? How old is she? Click the image for more detail. Then comment, please. Click on the image.

CDV Union sergeant smartly uniformed

Three inverted stripes makes him a sergeant. Is it me or is there a sadness or forlorn look in his eyes? Smart uniform; is off to the war? A horseman or infantry? Click the image for more detail. Then comment, please. Click on the image.