Every second that he does not die increases the probability that he will be alive for his entire term.
This does not include the probability that Vance dies prematurely.
Aging increases the probability of death.
If you think DJT has had a stroke, and want these probabilities to reflect this, click this box:
This is based on actuary data from The US Social Security Administration,
and assuming DJT is morbidly obese.
See also
this Quora post - not definitive, but interesting and plausible.