Looks like your input file is a CSV (comma separated variable) file so you should use an appropriate CVS module to dot he heavy lifting for you. Text::CSV is a good starting point. Consider:

use strict;
use warnings;
use Text::CSV;

my $filename = 'infos.txt';

open my $fOut, '>', $filename or die "Can't create $filename: $!";
print $fOut <<TEST;
Mawts 25,female,melbourne
Awts 24,male,sydney
TEST
close $fOut;

my $parser = Text::CSV->new();

open my $fIn, '<', $filename or die "Can't open $filename: $!";

while (my $row = $parser->getline($fIn)) {
    my ($name, $age) = $row->[0] =~ /(.*)\s(\d+)/;

    print "Name:    $name\n";
    print "Age:     $age\n";
    print "Gender:  $row->[1]\n";
    print "Address: $row->[2]\n\n";
}

close $fIn;
[download]

Prints:

Name:    Mawts
Age:     25
Gender:  female
Address: melbourne

Name:    Awts
Age:     24
Gender:  male
Address: sydney
[download]