I basically got this for free after the $10 certificate. I wish I could give it a good review but
unfortunately I can't.
First, I hate when you have to add numbers (especially with a
calculater) to reach an age. The problem with THIS trick is it only allows you to calculate the
last digit of a person's age. You have to 'guess' the first number by how old a person looks. And
the caveat from her...if you don't know...be kind and guess the lower age. So, based on that, this
trick is not fool-proof.