1965-1968 - Lost in Space
1966-1969 - Star Trek
1973 - 1974 - Star Trek: The Animated Series
1975-1977 - Space: 1999
1978-1979 - Battlestar Galactica
1980 - Galactica 1980
1987-1994 - Star Trek: The Next Generation
1993-1999 - Star Trek: Deep Space 9
1994-1998 - Babylon 5
2000 - Frank Herbert's Dune (Sci Fi Channel)
1995-2001 - Star Trek: Voyager
1999-2003 - Farscape
2002-2003 - Firefly
2003 - Frank Herbert's Children of Dune
2001-2005 - Star Trek: Enterprise
2004-2009 - Battlestar Galactica Reboot
Or from the other side, for every single living thing that has ever existed, at one point it was younger than you are right now. Many of them died younger than you are right now.
And a bonus one: yesterday is just as much as gone as the Roman Empire's time is.