The Core Duos were 32-bit, they only sold them for about 6 months before refreshing everything to the Core 2 Duo (64-bit). They were supported for 5 years thoug

The Core Duos were 32-bit, they only sold them for about 6 months before refreshing everything to the Core 2 Duo (64-bit). They were supported for 5 years though, not less than 3. 10.7 was the release that dropped 32-bit Intel support and that was released in 2011. 10.6 still got updates for a few more years though, it didn't die in 2011.