People Riding Bikes in a Heat Wave

I have made several posts about people using their bikes. In the sun, in the rain.... and now in a heat wave.

How do people react when it gets really hot? Say 40 °C? Surprisingly, it is not apparent for everyone that it's hot. Some people just shrug it off! Does age matter? Probably, as younger people seem to cope better.

Note: If the picture(s) in this post depicts yourself or someone you know and you want it removed, please let me know and I will remove it.