Joan Jett Good Genes or Good Docs?

3/21/2010 1:30 AM PDT

Joan Jett: Good Genes or Good Docs?

Joan Jett loves rock and roll and, by the looks of it, rock and roll loves her too.

Here's the 22-year-old former Runaways member back in 1981 (left) -- and 29 years later, the 51-year-old at her NYC film premiere this week (right).

She's a rock goddess.