"What should I do when teenage boys around her age ogles at her?"

Hah. Do whatever you want. How are we supposed to know what you should do?

"Should I ask them to stop or let them be? I must admit I did ogle at other girls when I was their age"

Ah hah. Here is where you've made it apparent that you don't like it when other boys ogle your daughter. Presumably because you think it's wrong, further presumably because you think your daughter's sexuality is something you feel the need to protect until the "right" time.

But your daughter is transitioning into adulthood. The "right" time will be sooner than you think. When she was your little baby girl you kept a tight leash, but now it's time to start loosening your grip so she can learn how to take care of herself. But as in all things, if you continue to hold too close she will rebel or resent, but if you let her go completely she might get hurt. This is the daily balance of being a parent.

So let the boys ogle, you're not in charge of them. Some of them might even make a comment to your daughter. Let her handle it and ask her about it. Give advice when she seems open. Certainly you should protect your girl from any serious danger. But these are the kind of waters that your daughter needs to learn to navigate.

"Should I ask them to stop or let them be? I must admit I did ogle at other girls when I was their age"

Here is where you've made it apparent that you don't like it when other boys ogle your daughter. Presumably because you think it's wrong, further presumably because you think your daughter's sexuality is something you feel the need to protect until the "right" time.

But your daughter is transitioning into adulthood. The "right" time will be sooner than you think. When she was your little baby girl you kept a tight leash, but now it's time to start loosening your grip so she can learn how to take care of herself. But as in all things, if you continue to hold too close she will rebel or resent, but if you let her go completely she might get hurt. This is the daily balance of being a parent.

So let the boys ogle, you're not in charge of them. Some of them might even make a comment to your daughter. Let her handle it and ask her about it. Give advice when she seems open. Certainly you should protect your girl from any serious danger. But these are the kind of waters that your daughter needs to learn to navigate.