@ Ziatron
I started out on Macs a year after you - 1985. Sadly, I can report that there were some Mac virii (viruses) up to and including OS9. After OS10, as far as I know, none, apart from some proof of concept stuff.
Think about the logic that the bad-guys, in my book the e-vermin, are now applying:
1. Windows has always been vulnerable, but so have Macs, Linux...... BUT
2. Windows = 85%-90% of the target audience...... SO
3. Target Windows...... BUT
4. Windows 7 plugs most vulnerabilities, and patches for other incarnations mean Windows grows ever harder to attack...... HOWEVER
5. Mac users are complacent..... SO
6. Target Macs with updated Windows trojans...... REPEAT
The battle has only just begun. It is time that Apple educates customers about using non-Admin log-ins for day to day work, and to only log-in as Admin for essential upgrades and maintenance. This is, after all, a key strength of the Unix structure within OS10.
What I would now like to see is an installation procedure that forces the set-up of 2 users, [Admin] and [Name] with entirely different passwords. This could be implemented within 10.7 final release.