Is it ever "too early" to start using Rogaine?

My understanding is that Rogaine is most effective at preventing/slowing hair loss, rather than regrowing anything. I'm 26, and although I still seem to have a full head of hair, I have the nagging feeling that it's not as thick as it used to be. At this point I'm really not sure if it's... show more My understanding is that Rogaine is most effective at preventing/slowing hair loss, rather than regrowing anything.

I'm 26, and although I still seem to have a full head of hair, I have the nagging feeling that it's not as thick as it used to be. At this point I'm really not sure if it's thinning---is there any harm in using Rogaine as a precautionary measure?
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