The wet bulb temperature is when your body can no longer cool with sweat. This is the same for everyone and is a relation between humidity and temperature. This

The wet bulb temperature is when your body can no longer cool with sweat. This is the same for everyone and is a relation between humidity and temperature. This is basically a physical thing and is the same for everyone. It means your body temperature will just go up until it reaches a point where you can no longer survive. Of course there's still differences on how much that matters. A healthy person can sustain a longer period of time with a slightly elevated temperature. A person with health problems may have issues much earlier. But in the end... with wet bulb temperature noone can survive without external cooling for longer periods of time.