When should you start caring for aging skin in your 20s?

If you're barely into your twenties and already wondering whether you should be doing something about aging skin, the answer is simpler than the marketing makes it sound. Prevention isn't about erasing lines you already have. It's about losing less of what you've still got. The collagen in your skin starts to taper off from your mid-twenties, and sun exposure speeds that up more than anything else. So the job right now isn't to pile on expensive actives. It's to protect the essentials in order: sun protection first, then moisture and barrier, and only then a proven ingredient or two.

Does collagen really start dropping in your twenties?

The firmness and thickness of your skin rest on collagen in the dermis. It doesn't vanish overnight. As you move into adulthood your skin makes a little less of it, and the fibers you already have begin to fragment (Varani et al., 2006). You'll see figures like "one percent a year" or "exactly from twenty-five" thrown around, but the spread between people is wide enough that the exact number isn't worth trusting. The direction, though, is clear. Collagen begins its slow decline from around your mid-twenties. Which means twenty-something skin isn't so much "problem-free yet" as "the stage where you have the most left to protect." For how firmness in the cheeks ties back to collagen, see cheek firmness and collagen.

Why does sun protection come first?

Left alone, that natural decline is gradual. What turns it sharp is what you add on top. Ultraviolet light switches on the enzymes that break collagen down, so you make less and lose more at the same time (Fisher et al., 2002). Much of what we read as visible aging, the fine lines, the slackening, the uneven tone, is widely understood to owe a large share to accumulated sun exposure rather than age itself. That's why the first move in prevention is sun protection, not a serum. It matters even more around the eyes, where thin skin shows the wear first. For how to think about early lines there, see fine lines around the eyes in your twenties.

Is prevention about losing less, not erasing?

The language around aging skin tends to poke at your anxiety, as if there's already something to reverse. For someone in their twenties, though, the realistic goal isn't reversal. It's holding on. Prevention is losing less, not erasing. One sunscreen applied every day, one habit you don't overdo, adds up to a real difference ten years out. And plenty leaks out through habits, not just what's in the jar. Hours spent with your head bent over a screen leave their own mark on the neck, for instance. That one gets its own piece: neck lines and looking down.

What should a twenties routine tackle first?

Prevention has a clear order of priority. The further down this list you go, the closer you get to "nice to have."

At the top sits sun protection. A generous morning application, topped up through the day, holds off much of the loss the last two sections described. Next come moisture and barrier: when skin is dry and its barrier is frayed, no active can do its job well. Only once those two are steady do you add a proven ingredient. The one with the strongest evidence for younger skin is a retinoid. Retinol has shown measurable benefit for fine wrinkles and collagen in human skin (Kafi et al., 2007). The order is sun protection, then moisture and barrier, then a proven active. If you want to run vitamin C and retinol together, sequence and strength matter, which is covered in using vitamin C and retinol together.

Is loading up on products the answer?

Deciding to start often sends people the opposite way: more serums, more steps, and skin that turns reactive from all of it. But if you keep that priority order in mind, the task is subtraction, not addition. Rather than piling on out of worry, keep the core and cut the rest. Protect with sunscreen daily, keep moisture and barrier intact, and when there's room, add one retinoid slowly. For your twenties, that's genuinely enough. The person who protects the essentials now is the one who loses the least a decade from now.

One thing today

• Start by applying enough sunscreen every morning. It is the single surest step in prevention in your 20s.
• Keep moisture and barrier as your daily base, and check that your skin feels comfortable first.
• A retinoid is optional, not required. When there is room, add just one, low and slow.