Straight Hair Can Become Curly as You Age... The Reason Might Surprise You!
Have you ever met someone who had pin-straight hair in their twenties but developed waves or curls later in life? Or perhaps it's happened to you.
It feels strange because we've always believed that hair texture is something we're born with. Straight hair stays straight, curly hair stays curly and that's simply how our genetics work but biology is not that straightforward.
As we age, our hair can become curlier, finer, coarser or more difficult to manage. These changes often become noticeable during periods of hormonal transition, such as pregnancy or menopause but they can also happen gradually over time. While they may feel unexpected, they're a natural reflection of how our biology adapts throughout life.
The explanation lies in a field of science called epigenetics.
Our DNA actually remains remarkably stable from birth however, the way your body uses that DNA is constantly evolving. A simpler way to visualise it is to think of our DNA as a piano. The keys never change but the melody depends on which keys are played and when.
Your genes are no different. They contain the same information throughout your life but your cells don't use every gene all the time. Instead, they continuously decide which genes need to be active & which can remain dormant, depending on the body's needs at that moment. Those decisions aren't random. In fact, they're shaped by the life your body experiences every day. Years of ultraviolet exposure, changing hormone levels, chronic stress, poor sleep, environmental pollution and even nutritional deficiencies all leave subtle biological signals that influence how your cells function.
None of these experiences rewrite your DNA in actuality but together they change how your cells interpret it. This is epigenetics in its simplest form: your genes stay the same but the instructions your cells choose to follow change over time.
Hair follicles are particularly sensitive to these changing signals. Every strand of hair begins inside a living follicle that contains specialised cells responsible for producing keratin, the structural protein that gives hair its strength, shape & texture. These follicles also house stem cells that regenerate new hair throughout your lifetime. In younger years, the environment surrounding these cells is relatively stable. Hormonal cycles are more predictable, repair mechanisms are efficient & the follicle continues producing hair per usual.
As the years pass, however, that environment begins to change. Oxidative stress accumulates, protein production becomes less efficient and repeated environmental exposure gradually alters the way follicle cells behave. None of this changes the genes responsible for hair structure. Instead, it changes how those genes are expressed. As a result, the follicle may begin producing hair with a slightly different architecture. Hair that once grew straight may emerge with a wave, curls may loosen or tighten & fibres that were once thick and resilient may become finer or more fragile.
Scientists describe the gradual accumulation of these changes as epigenetic drift, one of the recognised hallmarks of biological ageing. Rather than occurring suddenly, epigenetic drift develops over decades as cells respond to the cumulative effects of their environment. This helps explain why visible changes in our skin and hair often appear long after the biological processes driving them have begun.
This is where the conversation shifts from ageing to longevity. For decades, beauty has focused on correcting what we can already see, whether that's frizz, thinning hair or loss of elasticity. Longevity science asks a different question altogether. Instead of asking how to fix visible changes, it asks what was happening inside our cells years before those changes became noticeable. The answer, more often than not, lies in the gradual decline of the biological systems responsible for repair, regeneration and resilience.
Hair itself is not alive but the cells producing it certainly are. Every new strand depends on healthy follicle cells with enough energy to divide, repair themselves and produce strong keratin fibres. As these cells become less resilient with age, changes in texture, density and strength become increasingly common. The goal, therefore, isn't to stop biology from changing. Change is inevitable. The goal is to support the health of the cells driving those changes so they can continue functioning well for longer.
This is what inspires our work at The Lab of Skin Longevity. It reminds us that behind every visible change is a fascinating biological process waiting to be understood. That's where our research begins & where every Karmic Beauty formulation takes shape.
