Member Since shortcode? Country shortcode? (And I need a recommendation for a rating plugin)

Hiya!

I want a simple shortcode that will show how long a user has been registered with my site.

To give a longer explanation:

I’m making pages for each of my faculty. It will show their name, Gravatar, country, the words “Facilitator since” with their start date, and also their five-star rating. (I haven’t gotten the rating/review plugin yet; could recommend something that allows users to rate their facilitator using both a five star system and a written review, like yelp?)

I also need a short code to show their country.

Thanks!!