Drupal 6 is old, yes. But the few bugs I know of have been around for a while. Code does not rust. New software tends to have the most bugs; it's an opportunity to make new and exciting mistakes. :-)
Security-wise, Drupal 6 is still largely supported - they wrung most issues out over 39 point releases. Likewise, PHP 5.6 will fly until the end of the year. If necessary a move to PHP 7 should be doable. (Heck, it might even make things a little faster.) [2024 update: Currently on 8.3!]
Other underlying software gets updated every week or so. For example, we're on MariaDB 10.1, which was released five and a half years after I took over Flayrah, and OpenSSL 1.1.0, first released in August 2016. I'm updating to Perl 5.24 right now (hopefully won't break things). Need to talk to Timduru about FreeBSD, but as of now it's still updated.
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Drupal 6 is old, yes. But the few bugs I know of have been around for a while. Code does not rust. New software tends to have the most bugs; it's an opportunity to make new and exciting mistakes. :-)
Security-wise, Drupal 6 is still largely supported - they wrung most issues out over 39 point releases. Likewise, PHP 5.6 will fly until the end of the year. If necessary a move to PHP 7 should be doable. (Heck, it might even make things a little faster.) [2024 update: Currently on 8.3!]
Other underlying software gets updated every week or so. For example, we're on MariaDB 10.1, which was released five and a half years after I took over Flayrah, and OpenSSL 1.1.0, first released in August 2016. I'm updating to Perl 5.24 right now (hopefully won't break things). Need to talk to Timduru about FreeBSD, but as of now it's still updated.