I’m also ten and I believe my mom’s started at around that age too. You won’t necessarily get it at the age she got it, bout research proves that is women (and or young lady or girls) live together for a while ( like I do with my mom, I don’t know how you are connected with her though in life) then they will get their period at around the same time. Like in the same week or on the same day at one another. For the side note, yiu should use Ruby Love Period Products they have workout stuff for periods, swimwear, underwear, and pads and a lot of other stuff! Now, I haven’t gotten my period yet, but I do know a lot about them.
-KayQueen