I like your new take on live photography. Incredibly interesting change in perspective, to view one from behind.
I would say that in the photographs of the elderly, I noticed their posture most. Worn and curved with time, but more thoughtful than ever. To stare at ones feet while walking seems contemplative. I like that.
The youthful photographs show more determined figures. Facing forward, busy with the day, looking upward and engaging with technology. Buzzing with life and promise.
This says much about the stages in life. Excellent project and observation.