<Tr> <Td> Sheila Kelley </Td> <Td> Carol Rhodes </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> </Tr> <Tr> <Td> Chris Riggi </Td> <Td> Scott Rosson </Td> <Td> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Hilary Duff </Td> <Td> Olivia Burke </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Kevin Zegers </Td> <Td> Damian Daalgard </Td> <Td_colspan="2"> </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="2"> </Td> </Tr>

How old are the characters in gossip girl season one