That's quite okay, to identify with a certain age. Often we do have to think of someone who is that age. So, in the beginning if you can bring people you know in, you know about that age, then you kind of get a feeling for what average people look like at that age. For many of you, your parents might be my age, you have to think of grand parents for a higher age, for some of you actually your parents are the higher age. To identify with faces you already know, that can often help for getting a feeling how to do it and then later you would want to open it up to remember faces you've seen on the streets. Faces you've seen in the news or on the TV and so on.