Elderly woman uncovering her face before non-mahrams
Question

                Is it permissible for an elderly woman to uncover her face before men who are not her mahrams?.
Praise be to Allah.
    Yes, Allaah has permitted elderly women to uncover their 
    faces before non-mahram men, but that is subject to the condition that they 
    do not uncover anything of their adornment that may be a cause of fitnah, so 
    they should not wear attractive or fancy clothes or put any cosmetics on 
    their faces to beautify them. 

    Allaah says (interpretation of the meaning): 

    “And as for women past childbearing who do not expect 
    wedlock, it is no sin on them if they discard their (outer) clothing in such 
    a way as not to show their adornment. But to refrain (i.e. not to discard 
    their outer clothing) is better for them. And Allaah is All‑Hearer, 
    All‑Knower”

    [al-Noor 24:60]. 

    Abu Bakr al-Jassaas (may Allaah have mercy on him) said: With 
    regard to the words of Allaah, “women past childbearing who do not expect 
    wedlock” [al-Noor 24:60], Ibn Mas’ood and Mujaahid said: Women past 
    childbearing who do not expect wedlock are those who do not want it, and 
    their outer garments are their jilbabs. 

    Then he said: There is no dispute that the hair of an elderly 
    woman is ‘awrah and it is not permissible for a non-mahram to look at it, as 
    is the case with the hair of a young woman. If she prays with her head 
    uncovered, then like a young woman (in the same situation), her prayer is 
    invalid. So it cannot be that the meaning is that she may take off her head 
    covering in the presence of a non-mahram man. Rather it is permitted for an 
    elderly woman to take off her outer garment in the presence of men, after 
    she has covered her head, and it is permitted for her to uncover her face 
    and hands, because she is not desirable. Allaah says (interpretation of the 
    meaning): “But to refrain (i.e. not to discard their outer clothing) is 
    better for them” [al-Noor 24:60]. So He has permitted her to take off 
    her jilbab, but He says that refraining by not taking off her garment before 
    men is better for her. End quote. 

    Ahkaam al-Qur’aan (3/485). 

    Ibn al-‘Arabi (may Allaah have mercy on him) said: 

    This is mentioned only for women past childbearing age, in 
    exclusion to others, because they are no longer desirable, but refraining by 
    keeping the full covering is better than doing that which is permitted to 
    them, namely taking off their outer garments. End quote. 

    Ahkaam al-Qur’aan (3/419). 

    Al-Sa’di (may Allaah have mercy on him) said (p. 670):  

    Women who are past childbearing are those who no longer have 
    any interest in intimacy and desire, “women past childbearing who do not 
    expect wedlock” [al-Noor 24:60], i.e., they do not hope to get married 
    and they are not wanted in marriage, because they have grown old and are not 
    desirable. “it is no sin on them” i.e., there is no blame on them, “if 
    they discard their (outer) clothing” i.e., outer garments such as the 
    khimaar and so on, concerning which Allaah says “and to draw their veils 
    all over Juyoobihinna (i.e. their bodies, faces, necks and bosoms)” [al-Noor 
    24:31]. It is permissible for these women to uncover their faces, 
    because there is no fear of temptation. And because allowing them to take 
    off their outer garment may be taken as meaning that they are allowed to 
    adorn themselves, the matter is clarified by the words: “in such a way as 
    not to show their adornment” i.e., without showing their adornment to 
    people, by beautifying the outer garment or striking their ground with their 
    feet so as to let people know about their hidden adornments, because the 
    mere fact that a female is wearing adornments, even if she covers them, and 
    even if she is not desirable, is a cause of fitnah which causes the one who 
    looks at it to fall into sin. “But to refrain (i.e. not to discard their 
    outer clothing) is better for them” [al-Noor 24:60]. End quote. 

    Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allaah have mercy on him) 
    was asked: 

    Is it permissible for a woman of advanced years, such as 70 
    or 90 years old, to uncover her face before her non-mahram relatives? 

    He replied: 

    Allaah says (interpretation of the meaning):  

    “And as for women past childbearing who do not expect 
    wedlock, it is no sin on them if they discard their (outer) clothing in such 
    a way as not to show their adornment. But to refrain (i.e. not to discard 
    their outer clothing) is better for them. And Allaah is All‑Hearer, 
    All‑Knower”

    [al-Noor 24:60]. 

    Women past childbearing are elderly women who are not desired 
    in marriage and who do not put on adornment. There is no sin on them if they 
    uncover their faces before non-mahrams, but for them to observe hijab is 
    better and is more on the safe side, because Allaah says “But to refrain 
    (i.e. not to discard their outer clothing) is better for them” [al-Noor 
    24:60]. And in some cases seeing them may cause fitnah because of their 
    beautiful appearance even if they are old and not wearing adornment. But if 
    they are wearing adornment, it is not permissible for them to refrain from 
    observing hijab. Adornment includes beautifying the face with kohl and the 
    like. And Allaah is the source of strength. End quote. 

    Fataawa al-Mar’ah al-Muslimah 
    (1/424). 

    And Allaah knows best.