根据下面资料，回答题
My mother raised me with several fixed rules.  One was that a gentleman always has a cleanhandkerchief in his rear (后面的) pocket. I can recall being a ten-year-old on the school playground,feeling the piece of cloth directly over my bottom and wondering what it was there for. Time would tell.
Every night for most of my life, I have removed from my trousers the things I' m going to need thenext day--keys, wallet, and handkerchief. After 60 years, my body weight feels wrong if I' m headingout of the house with an empty back pocket.
This rule of behavior, of course, did not apply to one' s children in the late 20th century. When mythree kids were growing up, they all let me know that my handkerchief was ridiculously old-fashioned.They had their arguments. If you have to be prepared every day for a cold, why not carry a little packetof tissues, which saves you from that disgusting (恶心的) business of blowing your nose in the thing andthen stuffing it back in your trousers?
But a handkerchief is a lot more durable (耐用的) than tissue, creates no waste, and has a farwider variety of uses. One reason my kids saw that handkerchief so often is because of the large numberof chocolate mouths and skinned knees that handkerchief wiped. Can you hold the handle of a boilingpot with a tissue? Now that I am a grandfather of five, my handkerchief again has been put to use. Whenfriends become grandfathers for the first time, I often send them a dozen handkerchiefs as a s~nall gift. Infact, for Father' s Day last year my wife gave me several new handkerchiefs. Neither of us can count thenumber of times she was in tears at a movie and said quietly, "Can I borrow your handkerchief?"
Which of the following is true about the writer when he was a ten-year-old?