Depending on breed, management and environment, the domestic horse (including draft horses) today has a life expectancy of 25 to 35 years. It is uncommon, but a few animals live into their 40s and, occasionally, beyond. The oldest verifiable record was Old Billy, a 19th-century horse that lived to the age of 62.
TRUE. Validity is a necessary condition for being sound. 14. FALSE. A valid argument can have a true conclusion and false premises (see #11); and if an argument does not have all true premises, then it is not sound.
If you can demonstrate that an argument is sound and valid, not only do you have reason to accept it, but you can also defend this acceptance whenever someone asks you why you have done it. But when you can identify bad arguments, it will be easier for you to free yourself from beliefs which are not well founded.