In 2016, the International Agency for Research on Cancer classified drinking very hot beverages, above 65 °C, as 'probably carcinogenic' to the oesophagus. The problem isn't tea or coffee, but heat repeatedly injuring the tissue. Coffee itself is not classified as a carcinogen. Waiting a few minutes is enough to drop below that threshold.
Chlorine on its own is fairly gentle. But when it combines with urine, sweat and other grime from swimmers, it forms chloramines, which cause stinging eyes and that classic 'chlorine smell'. A well-kept pool barely smells at all. Shower before you swim and never pee in the water.
Muscle mass slowly shrinks with age, putting independence at risk. But in 1990, a study had nursing home residents aged 86 to 96 train their legs for eight weeks: their strength more than doubled. Muscle responds to training at any age. Getting up from a chair without using your hands is already an exercise.