My daughter is dating a much older man dr paul dating os
The general rule of thumb for age appropriateness is half plus 7.
The obligatory XKCD cartoon: 25 and 17 is slightly over.
It's like a drug and despite parents, friends, or even common sense whispering behind the scenes 'don't do this'.
She continues because the feelings she has are too strong. But I would be careful in how you deliver your feelings. Outline your concerns but let your daughter know you love and support her and that it is only natural for you to be worried.
I started dating my wife when she was barely 17, and I was 28.
But at the end of the day, I know at least they are healthy and safe. You might also be concerned if he were 17, given that what you are afraid of (her getting hurt, pregnant, or growing up too quickly, or him being with her just for one reason) can easily happen with a 17 year old boyfriend too.
You sound like a great parent and I wish the very best to you and your daughter. While such concerns are natural, and perfectly understandable, they are also irrational.
Recognize the powerful grip the 25 yr old has and that is normal. I would try and create a containment bubble around a situation you have limited control over but in reality you do have a way to contain the situation. Reinforce her education about the risks of getting pregnant and maybe set some soft rules like 'education comes first' Maybe she is in sixth form. It could be that the relationship is successful but if something goes wrong be sure she knows you are there for her if things collapse.
I get myself sick with worry in regards to my kids.