Laravel 6.0 input::value"old(' ')"

i am using this code but i am not working old function i have used both using this <?php echo old('title'); ?> AND Both Are Not workin please Help

 <form action="<?php echo route('post.create') ?>" method="GET">
 @csrf
        <input type="text" name="title" value="<?php echo old('title');  ?>"></br>
        <textarea name="contant" id="" cols="30" rows="10"><?php echo old('contant'); ?></textarea>

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