Abstract: The subject-matter of the present disclosure relates to a method of recommending an action for a user of an application to take to make a health improvement. The computer-implemented method comprises: receiving a plurality of user inputs responding to queries about a health of the user; generating a biological age based on the user inputs; displaying at least one recommendation to the user for managing the biological age; and receiving at least one further user input to make an action in response to the at least one recommendation.