She’s not your typical Instagram influencer, but 90-year-old Baddie Winkle might just be the most badass. Now, with her 3.7 million followers and penchant for posing in colorful swimsuits and lingerie, Winkle has teamed up with a mobile investing app called Stash for their latest promo. Stash’s mission is to simplify investing and make it… https://www.adweek.com/creativity/instagrams-hippest-grandma-lives-large-in-a-new-campaign-for-a-savings-app/