Dynamic if statement Issue

I want to make this if statement Dynamic

$Name   = "Test";
$Age    = "19";

if($Name == 'Test' And $Age > 18){
    echo "Success";
}

I want to use it like this

$Name   = "Test";
$Age    = "19";
$Statement = "$Name == 'Test' And $Age > 18";

if($Statement){
    echo "Success";
}

Please help me about it. Thanks