I don't like the very hot weather, say anything above 25 degrees C and I start to feel uncomfortable.
Even when I was younger I did not really like the hot weather.
I think I read somewhere that as you get older, you can then struggle to regulate your own body temperature, but not sure what age range that starts at though, or why that might happen?
As per the advice above, I tend to stay indoors as much as possible, drink lots of water, and keep the doors and windows closed.
We do have a large portable air con unit, (From machine mart, eg: Clarkes, cost about £300) with a long flexible vent, with a narrow slot at the end, which you place through a window, (its narrow so the window does not need to be opened much to allow the hot air out). We tend to place that in our dining room, facing our lounge through a pair of open double doors. Once its cranked up, and if we leave all the downstairs internal doors open, it keeps the ground floor nice and cool.
Only problem is its a bit loud, which is why we place it in another room a bit further away, and you do have to empty its water tray about once every couple of days, (only takes a minute or so). It is amazing how much heat it drags out though if you put your hand on the external vent while its running!
Upstairs in a our main bedroom, we have a large ceiling fan, which helps a bit, as the upstairs does tend to get a bit hotter than the downstairs, heat rises I suppose? But when its really hot it just tends to push warm air around, does not really cool the air. But you do get some movement of air which helps a bit.
We also have a couple of those large tower fans which can oscillate and have several speeds. We tend to use those mostly in the summer as they can be easily moved around and are ok for when its not boiling hot.
We tend to reserve using the air con only for those very hot days.
Our house is quite new, its about 7 years old now, so is very well insulated to a high standard, so it does seem to keep the heat in well during the winter months, and the heat out in the summer months.
But give me the nice cool weather anyday.....