It’s a tradition, I believe 🫂 like making a wish on your birthday or kissing when the clock strikes 12 on new year 

‘“Longevity noodles," often enjoyed in Chinese and other East Asian cultures, are named for their association with long life and prosperity. These noodles, traditionally served on birthdays, during Lunar New Year, and other celebratory events, symbolize longevity and well-being. The noodles are typically very long, uncut, and unbroken, representing a continuous, healthy life.

The belief is that the longer the noodle, the longer the life! In some customs, it’s also considered good luck to eat them without biting or breaking them to preserve their full length, further symbolizing the wish for a long and uninterrupted life journey.’