Interesting, because I think the older Jewish vote is going to help Biden a lot in Florida (and in general)
Among Jewish voters, about 70% are Democrats, and I think a good 60-65% of them would never vote for a Republican under any circumstance (for non Israel reasons). There are some that could be swayed, but the sentiment I've seen (in real life and on the internet) has been very positive towards Biden's handling of the war. And most who don't approve (including myself and a lot of my close friends), think he's not restraining Israel enough and would never vote for Trump.
Most American Jews (unlike Israels and I think British Jews) are very liberal socially and find the modern Evangelical/Trumpy Republican party super off putting. And that includes older people