Kindly refer to the following link(s):


https://islamqa.info/en/answers/229780/does-prostrating-or-bowing-by-way-of-greeting-come-under-the-heading-of-shirk


Bowing the head a little out of respect when greeting elders

Bowing or Touching the feet of Elders out of Respect 


Relation between Islam & Tradition


In class room when teacher enters the children stand up out of respect 


Standing up out of respect due to customs & prohibition in desiring people stand for you

https://www.assimalhakeem.net/is-it-allowed-in-islam-to-kiss-hands-and-feet-and-to-bow-down-in-front-of-scholars-and-elders/