Hollywood and modeling have made bad posture fashionable.
This has nothing to do with age.
Forward head posture can cause many problems like headaches, neck pain , shoulder / upperback pain , breathing issues, difficultly sleeping, TMJ and even depression . You have to remember that the head is balanced on top of everything below it, so forward head position is caused by things like kyphosis, hinged shoulders , forward hip posture and pelvic tilt imbalances . These imbalances not only cause pain and limitation but kyphosis has now been linked to an increased rate of death due to atherosclerosis !
To learn more check out this wonderful and detailed article by Deb Preachuk: