Documenting demographic trends help please!?

[Steve D]

Easy - look at the targeted market. Figure out, using demographic trends if this market is expanding and is it expanding in relation to other demographic groups. For example, using Facebook, if the majority of current users are say age 20 to 30, you would get demographic data based on age and then compare your target market and saturation to other markets (say 30 to 40 year olds). You can't do marketing without knowing who your market is - you certainly don't want to advertise to a market that is shrinking and in which you already have a 90% saturation rate.