世代 (shì dài): หลายชั่วอายุคน

This family has practiced medicine for many generations, passing the tradition down from the Qing dynasty to the present day—a history of over three hundred years.

His family were farmers for many generations, and it wasn't until his father's generation that they moved to the city to do business.

Protecting this forest is a responsibility for us across generations; we must not destroy it for short-term gain.

This folk song has been passed down through generations; although the lyrics have changed somewhat, the melody is still the same as it was hundreds of years ago.