Ours was the opposite. We think she was about 7 when we got her from one of those rescue-animals-from-the-animal-shelter groups. (Good for her - she was on Death Row.) It seems likely that she had been mainly an indoor cat up till that point (perhaps with the exception of whatever unfortunate incident resulted in the broken paw she had when we got her.)

We kept her indoors for the first several months to a year, and she never complained about that. When we gradually started introducing her to the outdoors (on a leash at first), she seemed scared and wanted to go right back inside.

But it didn't take long before she was like LET ME OUT, DAMMIT.