Questions about design

Hi, I need some help with the following issues please.

How can I make an input field accept only certain characters, for example letters or numbers only?

How can I disable screen elements from moving up whenever the keyboard appears?

I added a date picker to my app but I want to be able to generate an age from this, is that possible, as I want that age displayed on profiles? I want to then set a minimum age of 18 to be able to sign up.

thank you!

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