Most women start to get wrinkles in their early 30s. But why is it that some have flawless skin at 40, while others get their first wrinkles in their 20s? Much of it is down to genetic skin type ...

NAME: Gemma Collins, an engineer, from Chiswick, West London. AGE: 25. SKIN TYPE: Fair. GENETIC HISTORY: I inherited fair skin from my mother, a redhead. She doesn't tan, but I go a nice golden brown.