I have an older TV (not HD). Can I use Apple TV?

the new appletv 2 the black one can only be connected to tv's using hdmi connector

if your tv don't have that you're pretty much lost there are converters to older types of connectors but it's a gamle to pay the pretty high price tag to try to see if they work

if it's the older appletv 1 alu one it can also be connected to component input on the tv which is an older std. that may be on older tv's

if the the tv only have composite (even older then component) one can only get a black & white image by connecting the green component output from the atv to the red composite input on the tv