Hair loss.
I had shoulder-length, rather thick brown hair when I was younger. When I developed a receding hairline at around 30, I started using a clipper. Men often complain about hair loss, but having almost no hair on the head is convenient. There's no need to go to a hairdresser (you save money too), hair washing is done quickly (because there are only very short stubbles), and my head stays cooler in summer.
And you don't need to worry about your hairstyle, because there is none.
