Me and SO is 9 years apart, I know 2 other couples one in their 60’s that is 12 years apart, and all of us are happy.
I think it has something to-do with stages of your life.
Problem that you will face is her current stage in life, young and still childish. They can look mature because of tough times, but when you try to give them advise on issues, they don’t grasp the idea.
Was there, done that, got the T-Shirt.
If it is only to take out to movie and dinner now and then, why not?! But, there is a chance that you would start liking her, and then what are you going to-do?
Like others suggested, watch out for not becoming a father figure, then your feelings towards each other doesn’t match and it is you that would get hurt, she would move on to other guys, and only years later she would think about you the same way as you did at the beginning. (and maybe regret that)
Your feelings would be much safer if she were over 24…