DS always hated napping--seriously, he could go 10 days when he was a baby, and it was a miserable 10 days, but he'd do it. But he napped fairly regularly from about age 1 to age 3, then stopped.

My DD was a regular napper until she was 6, as long as she was in a quiet, dark place. Man, those were the days.... but you never appreciate it with your first kid. You just look back later and realize how awesome it was.