Related to the current election, that OG conservatives, or Reagan and Bush conservatives (referring to George H. W. Bush) are the same thing as MAGA conservatives.
The difference is, the old guard blithely preserved the kind of policies that shredded social safety nets and business regulations in favor of tax cuts, leading to precarity and the rise of paranoia that led to the Trump takeover in 2015.
The OGs just wish they had another mile or two of altitude to plummet, and are freaked out about the ground looming so close and rushing so fast. But they will still keep the same policies, and will still lay a ground of Ayn Randian, Reagan-worshiping Mitt Romney / Jeb Bush / Ted Cruz candidates until some other charismatic narcissist Mussolini-wanabe rushes in and plucks the whole party from their hands again. And they'll get all butt-smoochy with the new guy like Lindsey Graham did with Trump (after predicting how this loose cannon will end the Republican party).
They didn't just buy the ticket to ride. They bought stocks in the railroad line, and insisted that fascism-backed one-party autocracy was the destination. They knew it since Reagan. By George W. Bush it was showing serious signs even before the PATRIOT act.
So when people freak out today because we're on the brink of losing our democracy, I have to wonder where they've been the last two decades. How is it after George W. Bush, and torture and Iraq and the pig lagoons and Abstinence-Only sex ed, did you think another Republican president was a good thing? I know Clinton was scary, but did you take even one look at Trump?