If I update my phone, will I lose certain apps that are no longer available in the App Store?

I have been avoiding updating my iPhone 6s because of the news that updating your does make your phone slower. But there's this app I'm thinking of downloading but would need to update to do so.
My only issue is that I have some apps that I use regularly that are no longer available in the updated app stores.
So my question is, if I was to update, would these apps be deleted? Or will they be uneffected?

No that won't remove apps from your device that is no longer in the app store.

The only reason it would remove apps is if you're updating from iOS 10 or older to iOS 11 and if the app is only 32bit. IOS 11 doesn't support 32bit apps so they won't run/install if you're on iOS 11

You won't lose the apps but if those apps are not supported on the newer iOS then they will not work anymore.

As far as the slow downs:

1. That concerns batteries that are not in the best shape anymore
2. Apple has since released iOS 11.3 which gives the user the option to optimize for battery life or for performance IF your battery falls into the condition where it is necessary. Not everyone that updates would experience that, therefore given the option in the 1st place.

To answer the question, no, updating does not remove no longer available apps, but eventually (likely) since they are no longer supported they would cease functioning.

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