When donating a teenager's clothing, should it be categorized on It's Deductible under boy/girl or men/women? What is the appropriate age threshold?

[Opus 17]

Use whichever is closest to the actual fair market value of the clothing in your area -- what a thrift store or consignment shop would charge for the same or similar items in similar condition.

Be aware that ItsDeductible values are national averages and general figures only.  If you are audited, you will need to be able to show that the values you used are correct for your particular items in your part of the country.  You may want to check the price tags in a few thrift stores to see if the values are actually fair and reasonable.