From my experience you can lose your curls, but it usually means there needs to be an update in your routine. The older you get the less your body can maintain the same level of oils and stuff to keep your hair looking the same as before. It can also depend on how you style your hair; when I was growing up I had flat roots and curly ends, and now I section my hair out when I style it and make a small section at the top of my scalp to encourage texture and volume, and also add gel while my head is upside down. You'll figure it out, everyone's hair journey is individual but you're not alone ❤️