How do I turn off app age limitations on my iPhone?

only way to impose limitations in ios is screen time read

Use Screen Time on your iPhone and iPad - Apple Support

Make sure in screen time and you know the pin, you can put it onto 16+ again.

"How do I turn off app age limitations on my iPhone?: How do I turn off any app age limitations on my iphone 16? I did the update and now cannot use apps that are 16+"

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App Age Restrictions Issues:

A. Restart iPhone: I would recommend restarting your iPhone. Do the same after installing updates.

B. Updating your iPhone:

Have you installed any updates recently(iOS to others)?. If not, do so, as the latest bug fixes would be installed. IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

C. Update your iPhone:

If so, other than updating through the iPhone itself, you can update through a computer (Mac or PC), or directly through Cellular (not wise, if you have limited data set up).

• Update your iPhone Using a Computer - User Tip.
• Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip