Short Term Memory
There are many ways that you can do this. Word association is one of the most popular and easiest to use. Not only will this give you aliases to use to remember a person’s name, but it will also give you a mental image that is both easily stored and recalled at a later date. Since it has been academically proven that most people will remember a picture but not a wordy description, it makes sense that this method is so successful.

All that is required is to use the association in the first place, and you should find that you are able to bring back their details to the forefront of your memory, regardless of how long it has been since you last met. It’s similar to the way you were taught how to remember the months of the year at school (the “thirty days” rhyme).
For more info on Long Term Memory or Memory Tips go here.