Wikipedia
Mamil or MAMIL (an acronym standing for "middle-aged man in lycra".) is a middle aged man who rides an expensive racing bicycle for leisure, wearing professional style body-hugging bicycle jerseys and bicycle shorts.
The word was reportedly coined by British marketing research firm Mintel in 2010. It gained further popularity in the United Kingdom with the success of Bradley Wiggins in the 2012 Tour de France and at the 2012 Summer Olympics
Buying an expensive road bicycle has been described as a more healthy response to a midlife crisis than buying an expensive sports car.
In Australia the popularity of cycling with middle-aged men wearing lycra has been described as associated with the Tour Down Under and the 2011 Tour de France winner Cadel Evans. The former Prime Minister of Australia Tony Abbott has been described as a "mamil". This rise in popularity has been echoed in the United Kingdom where Olympic, Tour de France, and UCI World Championships victories in recent years have spurred interest.