Bagaimana cara menggunakan request::old untuk validasi laravel di form collective?

koreksi code dibawah ini:

{!! Form::open(['url' => 'pegawai']) !!}
{!! Form::label($text = 'Nama Pegawai :', []) !!}
{!! Form::text($name = 'pegawai', {{ $request->old('pegawai') }}, ['class' => 'form-control']) !!}
{!! Form::label($text = 'Umur Pegawai :', []) !!}
{!! Form::text($name = 'umur', '', ['class' => 'form-control']) !!}
<br><br>
{!! Form::submit($text = 'Kirim', ['class' => 'btn btn-primary']) !!}
{!! Form::close() !!}