I am looking for a single word which refers to the important events of a person's life. This might include birth, marriage, changing jobs, or anything else that the person feels is significant, but preferably when observed by looking at one's entire life.
A common word for these events is a milestone:
An important event, as in a person's career, the history of a nation, or the advancement of knowledge in a field; a turning point.
The term used in Health and Social care for things that happen during your life is your 'life course', like the different paths you take in your life-some planned and some unplanned. Sometimes your life takes a different path than planned, which happens to us all at one point or another.
A specific event that you'd expect someone to have is a 'milestone', such as their first steps, finishing school, getting their first job, getting married, having children etc.
an important portion or division of anything
The wedding opened a new chapter in my life
a point of time, especially one made critical or important by a concurrence of circumstances:
The death of Batman's parents was a critical and irreversible juncture in his life.
- an important, conspicuous, memorable, or enjoyable event, scene, part, or the like