en_tn/gen/18/12.md

After I am worn-out and my master is old, will I now have this pleasure?

You may want to add "of having a baby." Sarah used this rhetorical question because she did not believe that she could have a child. Alternate translation: "I cannot believe that I will experience the joy of having a child. My master is also too old" (See: rc://en/ta/man/translate/figs-rquestion)

my master is old

This means "since my husband is also old."

my master

This is a title of respect that Sarah gave to her husband Abraham.