I am a 59 yr. old male. The last couple of weeks I have noticed problems regulating my temperature, especially after hard activity outside. I m usually OK for 3-4 hours, but after that I have trouble shedding heat. I hydrate really well and take frequent breaks, but once I get heated up, I can t seem to get cooled back down and being in direct sun is really bad. It just saps my strength. Afterwards I take a cool shower and get in the air conditioning, but will randomly have my head get very hot and have to put something cool on my head or neck.