You could just create a reminder in the Reminders app. In fact, create a "health" list in the Reminders app, and put that and other health reminders in it.
You also need to take into consideration that you may not have an iPhone in 10 years (or they may no longer exist), so information of any kind that you store in it today will no longer be accessible. for that matter, predicting what technology will still be usable in 10 years is really a shot in the dark.
I maintain independence from technology as much as possible; important information that I need to keep for long periods of time I save in Evernote, which is technology independent, running on Windows, Mac, iOS, Android, Amazon tablets and directly on its website. So if my next phone is an Android (or a phone that doesn't exist today) I will still have access to my information. Evernote may not be around in 10 years, either, but as it's the most popular notes service around and has a strong business record the chances are pretty good. Then again, I may not be around in 10 years, either, so it would be moot.