Build a standard class

package Person;

use strict;
use warnings;

sub new {
    my ($class) = @_;

    return bless {
        name => '',
        age  => undef,
    }, $class;
}

sub name {
    my ($self, $name) = @_;
    $self->{'name'} = $name if $name;
    return $self->{'name'};
}

sub age {
    my ($self, $age) = @_;
    $self->{'age'} = $age if $age;
    return $self->{'age'}; 
}

1;