update
how do you update an older version Mac i think i bought in 2006
iMac, iOS 11.1, can't update
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Go to Apple menu -> About This Mac.
PPC = PowerPC, can't be upgraded past 10.5.8.
Intel Core Solo - can't be upgraded past 10.6.8
Intel CoreDuo - can't be upgraded past 10.6.8
Intel Core2Duo from 2006 can't be updated beyond 10.7.5.
Newer Intel Core2Duo & Xeons may be able to go beyond that.
Links on the numbers explain how to update.
Note, no Mac from 2006 has built-in sync support for iOS 11. The newest built-in sync support you can get for those Macs is for iOS 9.0. And no, unfortunately you can't downgrade your iOS device.
