If you say that someone does something at a tender age, you mean that they do it when they are still young and have not had much experience.
幼小的
If a company tenders for something, it makes a formal offer to supply goods or do a job for a particular price.
投标
Builders will then be sent the specifications and asked to submit a tender for the work.
然后建筑商们将会接到设计说明并被邀请参与此项工程的投标。