Time is the answer. Bank of Time

Momo is an orphaned baby girl who finds himself in a small town where he is friends with an elderly gentleman, Beppo and Gigi, a child who falls in love with her immediately and with other comrades: Enzo, Bruno, Livia and the little Chicco , That they create a home in an ancient amphitheater for her and a turtle that she has gathered in the street.

But the city is invaded by the Gray Lords who persuade people to make their day available, their daily actions their time in short. For example, the naive barber Osvaldo Fusi, who does not have much time to live with him, convinces him to save him in their special "Bank of Time" without ever indulging in hours of pleasure by putting them safe in their hands. Only in this way can they steal hours to humans so that they can survive.

https://elephantordon.wordpress.com/2016/07/23/time-is-the-answer-banca-del-tempo/