This idea of a "Grand Slam Offer" is from Alex Hormosi's book $100m offers.
A Grand slam offer is something that is so good there are no competitors (and something that you could charge a lot of money for)
An avatar is a person in a target audience
A demographic area that will be growing for a long time is people over 65.

Preview
1. A senior looking to socialize and play physical games for their level, from golf to kickball to chair volleyball
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You could create a franchise that could provide a variety of physical activities geared to seniors. More focused on socializing and fun than competition: there are already senior olympic games for the more competitive.