Yikes and ooopha at that age. Regardless if this was Jack laLane et al. elderly are significantly less effective at heat regulationthan when young 109 in the shade? Yeah 71 and way late 60's heat stroke has some of the same symptomology of hyopthermia that is confusion and bad decision making.
"Aging impacts thermoregulation in several ways (Figure 1), older adults (≥ 50 years) store 1.3 to 1.8 times more body heat when exposed to the same heat load than younger adults (19–30 years) during both exercising and passive heat exposure in both humid and dry conditions (35°C–44°C, 15%–30% relative humidity [RH]; Kenny et al., 2017; Larose et al., 2014; Stapleton et al., 2015a). The higher heat storage in the older individuals is due to a reduction in heat loss (Larose et al., 2014) caused by an attenuated sweat response (Kenny et al., 2017; Stapleton et al., 2015a) and increased dry heat gain (Kenny et al., 2017). ."
Quote from this article https://journals.sagepub.com/doi/10.1177/2333721420932432