Someone

Public Class Form1

    Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Edad = Integer.Parse(TextBox1.Text)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If Edad >= 18 Then
            MsgBox("Eres mayor de edad")
        Else
            MsgBox("Eres menor de edad")
        End If
    End Sub
End Class