It's true, you're not crazy, your hair texture can and does change throughout your life for a variety of reasons. Some people have pin straight hair as children that then curls up once they become teenagers, or others have tightly coiler hair when they are younger that loosens into curls as they get older. For some, the change may not be that drastic and you notice your hair get a little tighter or a little looser as you get older. So, you want to know why this happens, well there are lots of reasons that your hair texture changes.
and ageing are seen as the common causes for changes to your hair texture and quality.
You'd think, with the size of the hair industry, there would be a conclusive answer to this question, but research is still underway and there are no decisive results.