Eat fruit and take cold showers. The last time this was posted, someone said cold showers were the secret to looking young forever. I can't find much convincing official research (just blogs) to support that cold showers are beneficial to skincare, but I've been taking them nonetheless, and honestly, my pores have looked better :)
It is easier in tropical countries like Colombia, where “cold” is basically “warm”. In colder (northern) countries, I tried this but it is very hard because “cold water” (i.e., non heated) is way too cold (like minus temperatures).
I agree cold, hot, warm are all relative. Somewhat related I've seen people from hot countries worry about "cold weather". To them ~20C is cold compared to 35C hot day and was blamed to be the cause of colds and flu. Often perpetuated in movies and TV too a tired old trope. So yes to someone in a hot country a "cold" shower may be considered warm to someone from a cold climate.