<Tr> <Td> The Homemade Comedy Special </Td> <Td> Host </Td> <Td> Television special (NBC) </Td> </Tr> <Tr> <Td> Don't Ask Me, Ask God </Td> <Td> Future Son </Td> <Td> Television film </Td> </Tr> <Tr> <Td> 1985 </Td> <Td> Family Ties Vacation </Td> <Td> Alex P. Keaton </Td> <Td> Television film </Td> </Tr> <Tr> <Td> 1985 </Td> <Td> Poison Ivy </Td> <Td> Dennis Baxter </Td> <Td> Television film (NBC) </Td> </Tr>

How old was micheal j fox in back to the future