I have iMac which is three years old, I moved away from Windows because of all the virus problem associated with them.
Once you have an iMac you'll never look back despite them being a tad more expensive, you don't need a firewall- Norton Anti Virus or anything, so forget that side.
The after sales is exceptional, graphics out of this world and Garage band is perfect for making your own music. The whole system works differently to windows but everything available with windows I can get with my beloved iMac , Give yourself time to get to know the system,
I changed over when I was 69 and I know your obviously brighter than me, meaning anything is possible,
Ask around and make your own decision.
Kindest Regards Vony.