Nope, Mojave isn't going to happen on a 2008 Mac.According to Apple about the current release:
"if your Mac is running OS X Mountain Lion 10.8 or later, you can upgrade directly to macOS Mojave."
You can read it at:
As ajpaolello said, it's more a question of how current the OP can get. The OP did not ask about an upgrade directly to Mojave (as Mojave itself was never explicitly mentioned), just about an OS upgrade in general. OP said they are on 10.7.5, and while I know for sure they won't be able to get Mojave, they might be able to get something prior to Mojave. I would have to go look it up again, but I think ajpaolello is correct when mentioning El Capitan as the most recent that machine will be able to upgrade to.Nope? What did you think I said? I pointed out one reason why his computer does NOT qualify to upgrade directly to macOS Mojave.