American voters under 40 share a simple reality -- for most of their lives, a Bush or Clinton has been President.
The 20-year streak began with Republican George H.W. Bush's inauguration in January 1989 and ran through two terms for Democrat Bill Clinton and then two for Bush's son, George W., until Barack Obama took office in January 2009.
Now the latest polling indicates the next presidential election in 2016 may again offer familiar choices.
A CNN/ORC International survey released Monday showed Hillary Clinton -- the former first lady, U.S. senator and secretary of state -- way ahead of any other potential Democratic challenger, with Jeb Bush -- the former two-term Florida governor who is son of one president and brother of another -- among the top Republicans.
No one can say for sure if either will even run, and anything can happen in the more than two years before either would actually get nominated.
But if such a race happens, it would mean that at the end of the winner's first term in 2020, either a Clinton or a Bush would have occupied the Oval Office for 24 of the previous 32 years.
Even Barbara Bush, Jeb's mom, thinks that's too much. She told C-SPAN last month that "if we can't find more than two or three families to run for high office, that's silly."
Both candidates boast strong pedigrees due to their names and experience. The question is whether their political lineage will be a boon or a burden two years from now.
The early thinking is that Clinton's historic goal to be the first woman President better immunizes her from what analysts call possible name fatigue among voters.
"It is a good bet that women would propel Hillary forward, while Jeb Bush would be left behind," said Wendy Schiller, a political scientist at Brown University. "Both Clinton and Bush would be saddled with last names that incite mixed emotions among current voters, but she has a natural demographic constituency that he lacks."
In particular, "women vote in greater numbers than men and there is an 11% gender gap in favor of Democrats, which means that even Clinton fatigue can be overcome in a presidential election," Schiller added.
A Jeb Bush candidacy would make its own history, noted CNN Polling Director Keating Holland.
"There have been plenty of presidential candidates whose fathers also ran for President, and a few whose brothers have been candidates," Holland said. "But if Jeb Bush throws his hat in the ring, he will be the first candidate in history who fits into both categories. Does that help because the Bush 'brand name' is well known, or hurt because Jeb would be judged by the public based on things he did not do himself? Historically speaking, there is no way to tell."
He said one difference between Hillary Clinton and Jeb Bush involves final impressions of their familial White House predecessors.
"Clinton's husband was fairly popular in his last year or so in office and that wasn't true for Bush's brother or his father," Holland said.
Incumbent George H.W. Bush got thumped by Bill Clinton in the 1992 election, due to breaking a pledge against new taxes as well as the third party candidacy of Ross Perot who got 19% of the vote to presumably siphon off GOP support. George W. Bush had an approval rating in the mid-30s when his second term ended amid two wars and a recession.
After generally refusing to acknowledge any interest in a White House run, Jeb Bush last week suddenly said he would think about it.
"I'm deferring the decision to the right time, which is later this year," he said. "And the decision will be based on can I do it joyfully, because I think we need to have candidates lift our spirits."
"Something switched in Jeb," noted CNN Chief National Correspondent John King, pointing out that instead of distancing himself from the question, Bush now offered a timetable for a decision and a thematic basis that "you have to be joyful, you have to get uplifted, you've got to be optimistic."
His shift in stance coincided with political woes facing New Jersey Gov. Chris Christie, the early Republican favorite now facing multiple investigations over suggestions officials in his administration abused their power.
The CNN/ORC poll showed a pack of potential GOP contenders in a statistical dead heat so early in the process, including former Arkansas Gov. Mike Huckabee, Sen. Rand Paul of Kentucky, Bush and Christie, closely trailed by Sen. Marco Rubio of Florida and Rep. Paul Ryan of Wisconsin, the GOP vice-presidential nominee in 2012. As recently as November, Christie had an 11-percentage-point lead.
CNN chief political analyst Gloria Borger said Bush likely feared name fatigue when he decided against mounting a presidential bid in 2012.
"So the question is, if you skip ahead, four more years, will there still be Bush fatigue?" Borger wondered, adding: "We just don't know."
To Schiller, a Bush campaign would bring calls by his GOP rivals for fresh blood.
"You can bet that within the Republican Party, every other remotely viable candidate, from Paul Ryan to Rand Paul to Ted Cruz and maybe still Chris Christie will adopt a campaign slogan that calls for new leadership, and a brand new last name in the White House," she said.