Here’s a trick I came up with: 1. think of any number! 2. Add your age to the number! 3. Subtract the original number!
magical hand motions
The result is your age!
What is your partner's age? Add two zeros to the end. Minus your birth year from that number. Add the current year to this equation. The result should be yours and your partner's current ages.
Not if the one asked to do that calculation hasn’t had their birthday yet this year (in which case “current year - birth year” doesn’t yield age in years) or their birth year was over 99 years ago (in which case adding “current year - birth year” overflows into the partner’s age)
Close but not quite. If it helps, both birthdays have not occurred yet this year. If I assume BOTH have, the trick works.
Change the wording to “you will be this old this year” and it should cover both cases.