5 Common Skincare Myths at 40
And the science-backed reality

Skin has the capacity to improve at every age. Skin cells are constantly renewing, and using the right products — even at 50 or 60 — can make a noticeable difference. Studies show that retinol reduces wrinkles even in people in their 60s.

One of the most important lessons I've learned is that skin can be over-stressed. Adding several new products at once not only won't help — it can be harmful. A simple routine with four to five well-chosen products is far more effective than ten random ones.

Oily skin and dehydrated skin are two different things. Many oily skin types are actually under-hydrated — the oil production is overcompensating for this lack of hydration. A lightweight, non-comedogenic moisturizer like La Roche-Posay Effaclar Mat controls oil without increasing it.

UVA rays penetrate year-round, even through car windows. These are the same rays directly causing premature aging, dark spots, and increased skin cancer risk. Sunscreen should be the last step of your morning routine every day — 365 days a year.

Retinol is the most scientifically-proven anti-aging ingredient — but it must be introduced correctly. Fear of retinol usually comes from having used it too quickly at high concentrations. Start at 0.025% once a week and gradually increase. Your skin will adapt after 12 weeks.