That's a fantastic point and it comes up very frequently, particularly in the conversation around isolation and loneliness.
People may chose to be alone, and that's the way they prefer to be, so we can't make the mistake of perceiving that to be either loneliness or unwanted isolation. You're quite right, and preserving their autonomy is really important. Some of the ways you can do that is by not.... I refer to it as that gender-specific ageism. It's preventing an ageist approach in general and not making assumptions that, because you are a woman who didn't go to work and who is at home, therefore, you need service X. It's making sure that service X is available and accessible to those who would choose to take advantage of it, but it's not making the assumption or enforcing a blanket approach or blanket policy.
Make sure that they have the right and the privilege to choose how they would like to age on their own terms. You're quite right.