People between ages 55 and 64 are the fastest growing demographic on Twitter. The fastest growing demographic on both Facebook and Google+ is the 45- to 54-year-old age bracket. This is both a blessing and a small hurdle for salespeople who market via social media. On the one hand, it's another outlet to reach target demographics for life, health and retirement products, however, marketing materials should be formatted to each demographic — even the younger groups — specifically.