Birthdays - significance?

 https://ohr.edu/explore_judaism/ask_the_rabbi/ask_the_rabbi/7740#:~:text=Rav%20Moshe%20Feinstein%20reportedly%20insisted,Orach%20Chaim%206:29).

Rav Moshe Feinstein reportedly insisted that each of his grandchildren call him on his birthday to wish him well. Ginzei Yosef (4) writes that it is a good custom to recite a she’hechiyanu over a new fruit or a new garment on all of one’s birthdays. Rav Ovadia Yosef also notes that on any of one’s birthdays it is appropriate to have a special meal accompanied by words of Torah, and that such a meal would be a seudat mitzvah (Yabia Omer, Orach Chaim 6:29).