I agree that there won't be any serious type of "fight" going on, we will see the fight cut short if anything even remotely serious ends up for any of the fighters, but mine is more like unexpected punches type of thing. While we know that Mike Tyson packs a punch, meaning he could punch just once, a proper hit, like connects right to the chin, and Jake would be out cold, but I believe Jake would recover from that easily.
However, considering his age, I fear that if Jake gets lucky, not something that's easily possibly, I mean like lets assume he gets purely lucky, and punches right on the chin, Mike could have something that ruins rest of his life, just one bad punch and suddenly it's very dangerous for Mike Tyson. That's what I fear, that one punch.
Your concerns are legitimate, however boxers go through a natural process in which those that cannot take a hit, drop out of the sport as they simply do not have what is necessary to succeed.
Mike has proven he had everything to succeed, so despite his old age his resistance towards that kind of punishment not only should be very high, but I even think it should be even higher than what Jake Paul could endure despite the difference between their ages.