I have looked after guppies from when I was 12 years old. It was rather easy then back in the Philippines, no need for a heater as its warm 24/7 all year round.
I had so much fun breeding them and seeing the older generations replaced with more younger ones. I had to let them go one day as my mum wouldn't have them, she said I was getting too obsessed.
Now im in my 40s, so i decided to go back to my old hobby of looking after guppies. Things are quite different here in the UK. you need a heater, the water is different, etc... I now realise that guppies are quite picky when it comes to water, low nitrates, high oxygen, correct ph, etc...
These guppies do breed non-stop but they do perish quickly if the water isn't right.