Is hair loss caused only by genetics?

People often say that baldness is hereditary. That's true because children of bald parents also tend to be bald. But is it only caused by genetics? Can hair loss also occur later in life due to lifestyle habits or environmental factors?

I'm curious about what can be done to prevent hair loss.

When experiencing hair loss, it can cause stress and also incur high costs. What are the possible methods for preventing hair loss?