Among couples without children, pet ownership is still highest among young couples—those whose household head is younger than 45. Nevertheless, pet ownership among couples without children in the household has risen recently among working and retired older couples but not among young couples.
Overall, 59.8 percent of couples own a pet or pets, while pet ownership remains highest among parents and lowest among singles. About 70.5 percent of households with children owned a pet or pets at the end of 2006, in comparison with 42.1 percent of single-person households.
Source: 2007 edition of the AVMA's U.S. Pet Ownership & Demographic Sourcebook