Corrected entry: In the eulogy for Peter Parker he is described as being 26 years old, but the tombstone reads 1991 - 2018 (28 years).
Corrected entry: Miles gets bitten by an inter-dimensional spider, however his body never fluctuates throughout the movie, and neither does he get sucked into the portal in the final fighting scene.
Correction: The other Spider-Men were fluctuating because they were in the wrong dimension. Miles is in the proper dimension, and thus he doesn't fluctuate. The film doesn't establish that being bitten by a radioactive spider from another dimension should have the same effect as being in the wrong dimension.
Corrected entry: Peter gets some bruises and wounds on his face when he meets Miles, but the next day those are gone.
Correction: Spiderman has an accelerated healing power.
Correction: 1991-2018 is 27 years. Assuming he died before his birthday, 26 years old would be correct.