The passage that carries the number
In Joshua 14 Caleb is eighty five. He counts back forty five years to the day the promise was spoken at Kadesh Barnea. He does not say the years were easy. He says he was kept.
Then he asks for the hill country, the terrain with fortified cities and giants, the assignment other people declined.
Preservation is not the same as delay
The forty five years included wandering that Caleb did not cause. He carried a faithful report and still walked the wilderness with everyone else. Preserved strength does not mean protected from company or consequence.
This is why forty five reads as vocational rather than sentimental. The years were not lost. They were the training for the terrain.
How to mark a forty fifth year
Name the promise you received earlier than you were ready for it. Name what has been preserved in you. Then name the mountain, not the plateau, and name the people required for the climb.