It also says, "For twin pairs under 40, the heavier one looked significantly older. But surprisingly, after 40, that same four-point difference in BMI made the heavier twin look significantly younger. The study's authors theorize that "volume replacement" - that is, fat filling in wrinkles - accounts for the rejuvenated appearance of the older twins. This theory was supported even more dramatically among twins older than 55. For them, having as much as an eight-point higher BMI than their twin was associated with a younger appearance in the face."
Maybe I should gain weight!
Read more here.