You have actor Thomas Gibson, as born in 1962,but somehow, was in the Guilding Light and As the World Turns in 1952 and 1956. Not possible.

Sure. The number in the far right column is the title date. It's when the series premiered. It helps distinguish the title from similarly named ones. Gibson's dates on the series are listed next to the character name:

Another World (TV Series)                                    1962
Sam Fowler #2 (1990) 
As the World Turns (TV Series)                            1956
Derek Mason (1988-1990)
  The Guiding Light (TV Series)                            1952
Peter Latham (1987)

1987 on The Guiding Light , 1988-1990 on As the World Turns , and 1990 on Another World . Simple as that.