If you order wine and it's brought to your table by the wine steward, you'll need a separate tip for him or her that is based on the cost of the bottle of wine. Sometimes it's much easier to look at a chart instead of doing math in your head.
To quickly determine how much a 15% tip is, figure out what 10% of the bill is, then add half of that total to the 10% figure. If you are one of those people, refer to the handy restaurant tipping chart below to help you determine how much to tip.
I found an interesting article that proposes a math equation for suggesting the age of people you should be willing to date.
Women cannot be men, romantically." came out in 2013, revamping the advice and catering to young women who are dating in the age of social media.
As that article points out, you should date the person who makes you happy (regardless of age) and I made this chart out of interest for the topic, not as some kind of rule that I think should be followed without question.