Store the order you want in an array.
$ perl -Mstrict -Mwarnings -E '
my %people;
$people{ Fred }->{ age } = 37;
$people{ Fred }->{ sex } = q{male};
$people{ Fred }->{ occ } = q{plumber};
$people{ Mary }->{ age } = 41;
$people{ Mary }->{ sex } = q{female};
$people{ Mary }->{ occ } = q{barmaid};
my @order = qw{ age sex occ };
foreach my $person ( keys %people )
{
say qq{$person:};
foreach my $attr ( @order )
{
say qq{ $attr: $people{ $person }->{ $attr }};
}
}'
Mary:
age: 41
sex: female
occ: barmaid
Fred:
age: 37
sex: male
occ: plumber
$
I hope this is helpful.
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