Women's skin tends to wrinkle more easily than men's, according to recent research.
The study, conducted by a team of plastic surgeons from the Netherlands, focused on the gender-specific differences in the formation of wrinkles around the mouth.
Treatment of wrinkles in this area remains problematic, an issue which prompted Dr Emma Paes of the University Medical Center in Utrecht to "consider the reasons why a particular treatment may or may not be effective".
The team discovered that the skin around a woman's mouth contains fewer sweat glands, sebaceous glands and blood vessels, all of which could contribute to the development of wrinkles.
The researchers' findings were published in the Aesthetic Surgery Journal and presented to the European Association of Plastic Surgeons.
Dr Paes said that "having more basic knowledge about a problem can speed up the process of finding the right solution" and hoped that this new research would provide insight.
There is currently a wide range of treatments available for wrinkles including the use of lasers, botulinum toxin injections, injectable wrinkle fillers, dermabrasion and chemical peels.