my $dbh = DBI->connect($data_source, $opts...);
my $update_stmt = $dbh->prepare("UPDATE tbl_name SET `CUSTOMER NAME` = ?, AGE = ?, STATUS = ?, ...");

...

$update_stmt->execute(
        defined $customer_name ? $customer_name : undef,
        defined $age           ? $age           : undef,
        defined $status        ? $status        : undef,
        ...);