You don't have to precisely draw a statute of limitations to know that claiming land because of what happened during the reign of the Emperor Vespasian is completely insane.
> How many live in areas under the control of Palestinians?
Are you seriously asking this? There are nearly a million Israelis living (illegally, according to international law) in the Palestinian territories, but the Israelis will never let the Palestinians exercise legal authority over them. The Israelis have effectively annexed large swaths of the Palestinian territories, and wherever Israelis settle, the Palestinians are not allowed to exercise any control.
> It’s absolutely not safe for anyone visibly Jewish to enter Area A.
Dude, I have family members who have gone to Area A. They told me that the Palestinians were lovely to them, and mainly complained about how much their lives were restricted by the Israeli military occupation. In contrast, they told me that Israel was the rudest society they had ever experienced, by a very large margin.