For reluctant people, you can always speak to a psychologist and try working the other way around.
As in how can you respond to them and how you can involve them in therapy as a supportive person instead.
It is very common that elderly people think that counseling is only for mentally illness and not for anything else.
Once the person is receptive towards therapist's suggestions then the intervention can move in the required direction.
Next Steps
Please consult a psychologist and first brief them regarding the issues. Post which you can work it out further.
Health Tips
You can consult me online or in clinic via practo, or consult any other professional nearer to you.