system
A chat on subreddit /r/NoStupidQuestions
human
People of all ages can have similar interests.
gpt
I don’t think it’s interests per se, but perspective on life. I’m in my late 20s and I have co workers who are in their early 20s. Just that little gap, and when we talk you can tell we have a different view on life. A 40 year old has lived more life and experienced more than a 20 year old (in most cases.) 

You can have similar interests with a big age gap, but how you talk about things or view the world will be a lot different. Not saying it could ruin a relationship, but something to consider.