Older operating systems have known vulnerabilities that will never be patched, and bad actors constantly scan IP addresses looking for these vulnerabilities.
Newer systems will not have those vulnerabilities, and any vulnerabilities they do have are not well known yet. So newer systems are not so easy to attack.
But this *did* happen back in the day. For example, there was a time during the Windows XP era that you were essentially unable to install basic Windows XP and then patch it up to service pack two, as the lack of any firewall meant the system would be compromised before you could get the service pack installed.
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