Homeaway requires a rental agreement, you can send one per property SETTINGS -> CHANNEL MANAGER -> HOMEAWAY XML > Rental Agreement PDF URL, or for individual Units, SETTINGS -> CHANNEL MANAGER -> HOMEAWAY XML > SPECIFIC ROOM CONTENT > Rental Agreement PDF URL
You can set the minimum age via a "Custom" value in SETTINGS > CHANNEL MANAGER > HOMEAWAY XML > SPECIFIC ROOM CONTENT.
==== Children====