A new app is encouraging people to invest in the share market when they're younger.

The app's called Sharesies and allows people to put in as little as five dollars.

Those using the app, range from the age of 18 to 88 but most are under 40.

CEO and founder of the app Brooke Anderson told Rachel Smalley they've not been on an active marketing campaign.

"A lot of our customers are coming direct or organically so they are haring about Sharesies through their friends or family and signing up."

LISTEN ABOVE AS BROOKE ANDERSON SPEAKS WITH RACHEL SMALLEY