<Tr> <Td> 1979 </Td> <Td> A Vacation in Hell </Td> <Td> Margret </Td> <Td> Television movie </Td> </Tr> <Tr> <Td> 1979 </Td> <Td> The Runaways </Td> <Td> Janet </Td> <Td> TV series; season 2, episode 2: "Throwaway Child" </Td> </Tr> <Tr> <Td> 1979 </Td> <Td> Skatetown, U.S.A. </Td> <Td> Susan </Td> <Td> Theatrical release </Td> </Tr> <Tr> <Td> 1980 </Td> <Td> The Idolmaker </Td> <Td> Ellen Fields </Td> <Td> Theatrical release </Td> </Tr>

How old is the actress that played marcia brady