David is establishing economic independence, pursuing a career, and is considering getting married in the near future. david is very likely in the adulthood stage of life.

early adulthood

Explanation:

David is working to have economic independence, while he studies and works. People in his age range would often consider getting married after having some economic stability and in the interlude, they will also explore different lifestyles. Some psychologists set the ages 20-30 to identify early adulthood, although it can extend.

This stage is characterized by healthy, active social life and romance, or the pursuit of professional careers as components of adult life.

David should have arrived at a stage where he is at the peak of a physiological and physical maturation process.

His muscle strength, reaction time, and other abilities are well developed