This rule has been a gift to many math teachers. Here’s as comprehensive a post as any that I’ve found showing what can be done with this problem.
… it is sometimes important to consider how your relationship may be viewed by your peers.
One of the most well-known rules of thumb is the half-your-age plus seven rule. This rule tries to quantify the intuitive idea that if you are dating someone younger than you, they should not be TOO much younger than you. Specifically, the rule says:
- You should not date anyone before the age of 14.
- Once you are 14, you should not date anyone whose age is less than half of your age, plus seven years.
Read more here.