Nope? What did you think I said? I pointed out one reason why his computer does NOT qualify to upgrade directly to macOS Mojave.
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.
@ samsup50,
As for how you will go about getting that upgrade, you may need to actually search the Mac App store for El Capitan. IIRC, the App Store may not make it obvious as to where the upgrade can be obtained.