Turning Point, Critical Juncture, Milestone
noun
What seasons should you keep an eye on? The seasons that are turning points in your life. Keep an eye on those seasons, because you don't want to miss the critical junctures and milestones.
ふしめ
This word uses the kun'yomi of both kanji. You haven't learned that yet for 節, so here's a mnemonic to help you remember it: The real turning point in your life was when you got yourself a few sheep (ふし). Owning a few sheep was a true milestone for you. Now you have all the wool sweaters and cheese you could ever want!
成人式は、大切な人生の節目です。
The coming-of-age ceremony is an important milestone in one's life.
そしてその年、人生の大きな節目になる出来事が起こったんです。
Then that year, something happened that would become a major turning point in my life.
今から思うと、あれが一つの節目だったんだろうね。
In hindsight, I guess that was a critical juncture.