幼维 The determinant on the left is different.

you4 young https://hanziyuan.net/#%E5%B9%BC
ya3 elegant
wei2 hold together, maintain, preserve, dimension
https://hanziyuan.net/#%E7%BB%B4


zhi4 infantile, young


 

糹/ 纟Mi string, ribbon, fine silk

https://hanziyuan.net/#%E7%BA%9F

 

Yao single thread: thus also thin and by further extension, youngest.

https://hanziyuan.net/#%E5%B9%BA