Many older Americans can still recall the Six-Day War in 1967 or the Yom Kippur War in 1973, during which Israel’s very existence seemed to be threatened by its Arab neighbors.

By contrast, “young Americans have grown up with Israel as an incredible superpower in the region, and with occupation and intifada,” said Ira Stup of J Street, the liberal-leaning pro-Israel lobby group. “Young Americans often have a vision of Israel vis-a-vis Palestine that is more in line with what is going on now.”

There is no mistaking the depth of the generational split.

Late last month, Gallup asked Americans whether Israel’s recent actions against Hamas were justified or unjustified. Those who were 65 or older backed Israel by a wide margin: 55 percent to 31 percent. But those aged between 18 and 29, said by more than a two-to-one margin — 51 percent to 25 percent — that Israel’s actions were unjustified.