Hello, I need to input information from a person to a specific variable in one scene and use the information in another scene. How can I do that?

Questions & Answers
1

For example: the user inputs his age as “25” and store it as AGE in the start. In some other scene, i need to show a text which says: "Your age is [AGE] years old. How will i be able to do that in C#. Thank you in advanced!

2

There are many ways to do this.

You can use a static class.

public static class PlayerSessionData
{
    public static int age; // this will be persistant
}

public class PlayerData : MonoBehaviour
{
    // then you can map this value anywhere to use it
    public int age
    {
        get { return PlayerSessionData.age; }
        set { PlayerSessionData.age = value; }
    }
}

Or you can use a static variable in a class

public class PlayerData : MonoBehaviour
{
    public static int age;
}

Or you can use PlayerPrefs to store it, this will be available from a session to the next then.

public class PlayerData : MonoBehaviour
{
    // then you can map this value anywhere to use it
    public int age
    {
        get { return PlayerPrefs.GetInt("PlayerAge"); }
        set { PlayerPrefs.SetInt("PlayerAge", value); }
    }
}

Or you can also keep all this in one script, on one object, across loadings with DontDestroyOnLoad, simply disabling display of UI elements when you need.