Wow... you didn't even know what it was and got it.
Yes, both were the same riddle.
Yes, body of literature (You don't say your reading the Body of a letter, but the body itself needs to be written( or said), the rest is fairly self explanatory)
... Hooman, stop being good.

no don't. Most of these wouldn't get solved much without you.
Man walks on 4 legs (crawls) in morning (early life), on two at noon (midlife/adulthood) and 3 (two legs and a cane) in afternoon (late life, now classified as your "70's - 80's).