App for old people

I am looking to develop an app that is tailored specifically to the needs of seniors. This app would work on mobile phones and provide reminders and alerts to help users keep organized and on task. The app would include such features as setting reminders for take medicine, paying bills, making appointments, etc. As the user interacts with the app, they will find a variety of features that are tailored to helping seniors perform everyday tasks with ease. I am wanting to charge for the app in order to ensure it is reliable and of the highest quality. App should have two interface, one for elders which shall be easy to use and work with 3-4 taps and a connected with another app interface in son’s phone from which son can feed data, pay and get notifications. A third interface shall be for service providers so that they can list themselves and we shall connect them to our users based on pin code area.