Since you need two advertisements, I have attached images of two advertisements that I found in magazines. I will answer the questions using those two ads.
The first advertisement is for the Rosetta Stone software for learning languages. This is a set of CDs that allows a user to learn a language by looking at pictures and hearing them described in a foreign language. Let us now look at the demographic characteristics of the target audience for this ad. This ad is aimed at people who are at least in their thirties and perhaps are much older than that. We can assume this because the ad features a version of Santa Claus that is clearly not meant to be young and “hip.” This ad is not aimed at either gender in particular. However, it is clearly aimed at people who are fairly well-to-do and who life a middle class lifestyle (or better). It is aimed mainly at educated people. We can say this because the ad is for very high-priced goods. We can also say this because only educated people who are fairly well-off are likely to be interested in learning a language and the leisure time to spend on learning.
The second ad is for eggs. It is meant to persuade us that eggs are actually healthy. Again, this ad is not necessarily aimed at either gender, though women are more likely to be making decisions about what foods to buy and to cook. The ad is aimed at older people (probably mainly people 40 and above. It is aimed mainly at educated, middle class people. We can tell it is aimed at older people because they are more likely to worry about their cholesterol. We can tell it is aimed at an educated and upscale demographic because they are more likely to be very aware of health issues.
Both of these ads, then, are aimed at relatively upscale audiences who are generally not particularly young.