Life themes

It would be interesting to get a good understanding (i.e. some good data) on how life's themes and preoccupations change over lifespan.

A Gantt chart would be an interesting way to present it. It would give people a road map of what to expect from life. Here's an oversimplified example:

How would we go about collecting such data? Respondents are asked to list their preoccupations on a regular basis, but are also prompted at intervals to confirm whether something previously identifid as a preoccupation is still one.

The same approach could work for worries, likes, dislikes, etc