When I was 23 I was dating a 36 year old. I've dated several other "older" men. The relationships inevitably didn't work out. At the time I didn't understand why but now that I'm 39 I cannot see dating a guy 13 years younger than me- the life experience, goals, etc. would be so different we'd have little in common and I'm sure the guys I used to date felt similarly. But there was nothing dangerous about it. They were nice guys. We enjoyed each other for a while. Provided this guy isn't trying to control your sister by preventing her from seeing her family and friends, etc, (signs of an emotional abuser, who sometimes seek out very young women because they are easier to control) then he's probably fine. Your family should not try and cut her off over this, and it's a shame your parents are acting like that. She is a legal adult, she has every right to date a man of whatever age she wishes. If your parents truly wish to have some influence, they'd be better off supporting her and loving her than threatening her which might cause her to dig in her heels. My step dad is 13 years older than my mom, and they've been married over 25 years now. My husband's parents have over a 20 year age difference (and he started dating her when she was a teenager) and they have been married over 40 years now. Age isn't nearly as important as how the people treat one another. If this man is respectful to your sister, I think that's what matters.

if both members of a couple are 21 or older, age ceases to matter...as long as both are being treated well

24 is very young, he's too old for her. Sorry, I'm with your parents on this one...but I don't necessarily agree with threatening him unless there's more to the story that we don't know. I'm a parent and I would be less than thrilled but it's not the end of the world. Just my opinion..

This was going to be my next question; if she has a history of making bad relationship choices causing your parents to go off the deep end but you already answered what I was suspecting.

Shes 24, thats old enough to make her own decisions..by 25 you are the person you are going to be bar a life changing experience...if the parents are threatening and controlling maybe that is why tends to gravitate towards the guys she does...

I think that you should support your sister, as you seem to be doing! but also be a little wary until the relationship has matured a little bit.
Im currently living with my boyfriend who is 8 years older than me (not quite the age gap as with your sis), and I rarely remember that he is that much older because we are so compatible.
The one thing that concerns me with your scenario is the fact that this man is divorced with children. I know I have had issues in the past (my boyfriend has an 8 year old daughter with his ex), and it took a lot for me to be able to be in a place where I didnt feel like I was splitting a family up. (Just to clarify, my bf and his ex were broken up for 9 months before I met him). Its an incredibly hard situation, and because there are children involved that ex will never be out of the picture. Have your sister's back, be someone that she can confide in, and most importantly be supportive. Once the relationship has matured, and your parents can see that your sister and her bf are is a mature relationship their point of view may change.

At 14, yes, dangerous. At 24, old enough to learn the hard way!!

As a father of three I can see why your parents would not be happy, But she is 24 and it is her decision.

There's a saying -- "Age only matters, if it matters to you."

Your sister is your parent's last child (or baby), and she's still living at home, so they are concerned about the (2 decades?) large gap in age (old enough to be her Dad gap); but she is 24 years old and really old enough to make her own choices.

My sister just asked me this same question becuz her youngest daughter is engaged to a guy a decade+ older and divorced, etc. I told her the same thing as some here have -- as long as he treats her right and she is happy; that is what matters most.

I agree with some of the other posters - at 24, your parents really have no say in what she does. I can understand why they don't like it, but they're going to have to back off and let her make her own mistakes.
Personally, I don't see what the big deal is. If she were underage, then yes, it would be a concern. But she's 24, and a consenting adult.
If he were a bad person, then it would be a different story. Of course, he may very well be a bad person, but he could also be a very good person - being divorced with children and dating someone many years younger doesn't automatically make someone a bad person.

Rupert Murdochs wife is 40 years younger than him, no one seems to care

I would just stay out of it after already telling the parents to just calm down, theres nothing more you could do or say... people will eventually do what they want.
Maybe if your sister is ready she can introduce you two so you know first hand what he is really like that way you can also calm your fears.
Age is just a number in some parts of life.

I am 18 years younger than my husband and we have a wonderful marriage! We have been together five years, and are very much in love. We are very different people in some ways but we share many similarities as well. Both of us do our best to take care of our relationship as well as our own mental and emotional well being.
So...no, I don't think it's "dangerous", but I will say that I think your parents are dealing with a young adult and as such they've played their cards VERY poorly in my opinion. I think the best way to get someone to do the opposite of what you want them to do? Back them into a corner. And I think that's dangerous.