Children who are of a tender age don’t need to be exposed to the harsh realities of life.
Their memories of life in the refugee camp are still tender.
The word "tender" is often used in situations that involve romance:
Maria has a tender heart that breaks easily.
Jim still feels a little tender following his divorce.
Husbands and wives express their love and tenderness towards each other. (The word "tenderness" is a noun.)
He tenderly kissed her on the head. (The word "tenderly" is an adverb.)
This word can also be used as a verb. In this case, it means to give, but this is a very formal use of the word, and it’s almost always used for resignation from a job or in connection with business deals.
Peter tendered his resignation. (tender = give)
Gloria looks forward to tendering her resignation letter.
The partners have tendered an offer.
A dollar bill is legal tender. (legal tender = money. The word "tender" in this sentence is a "noun."