Genetically, ageing skin is inevitable. Early signs appear around 25-30 years old, but the process rapidly speeds up from 40 onwards, largely due to hormonal changes that occur. Short nights leave us looking haggard, dark circles are harder to shift and waking up with a wide-eyed look seems to be a thing of the past. The skin loses its elasticity and firmness, wrinkles deepen and become more visible (especially around the eyes and lips), the nasolabial fold is marked, our cheeks sag and there are bags under our eyes. Sorry, we'll stop now. But this is when anti-ageing treatments really become a must.