It’s normal that kids push for adult privileges. It is up to you  to keep your kids, kids. They will have plenty of time to experience adulthood. Their childhood years are very limited. Think about it, they have 14ish years to be kids, they have 70 years to be adults. Also, allowing kids to be adult-like is too confusing. They are simply not ready for that role.
It’s ok for them to bide their time on JV sports. It’s good for them to learn to wait their turn. Plus kids who peak too early usually fail to strive for more. It’s up to you, the parent to hold the reins.
Make-up and provocative dress, again, this needs to wait until the kids are ready. I can not tell you when, but make-up can wait until high school and for God’s sake, never encourage a sexy top until she is ready to graduate high school. It’s really a good thing to be an old-fashioned Mom. Later the kids brag about Mom and Dad being mean.