For my third observation, I observed that my grandparents staying at my home take very long to cook a simple meal. They cannot stay at the stove to stand and cook food there for long periods of time as their legs are much weaker than ours. So, they will take breaks and sit at the sofa when the food is cooking.
Sometimes, they forget about it and it ends up overflowing or being burnt.
This can be dangerous for elderly who stay alone as if they fall asleep while the food is cooking, something may happen and cause a fire, which will endanger not only themselves but their neighbours too.