-10 years.Janet Hubert played Aunt Vivian and Karyn Parsons played her eldest daughter Hilary. Parsons was 24 in the first season in 1990.
Six Feet Under
-12 years: Frances Conroy played Ruth Fisher and Peter Krause played her son Nate.Krause was 36 at the beginning of season 1 in 2001.
More under the cut
[Spoiler (click to open)]
grounded for life
- 12 years. Megyn Price played Claudia Finnerty and Lynsey Bartilson played her oldest daughter Lily. Bartilson was 17 at the start of season 1 in 2001.
- 12 years. Jeffrey Dean Morgan plays the father to the brothers. Jensen ackles is 12 years younger than morgan.
- 8 years.John Amos played James Evans and Jimmie Walker played his son JJ. Jimmie Walker was 27 at the start of season 1 in 1974. Fun Fact; Esther Rolle who played Amos's wife was 19 years older than him in real life.
- 6 years.Len Cariou plays Tom Sellecks father on the show, but they only have a 6 year age difference between them.
- 1 year. Estelle Gettey played Bea Arthur's mom. Estelle Gettey was one year younger . Estelle Getty wore aging makeup and wigs to appear as if she was 80.Below is Gettey out of the aging makeup and wig.
Mike and Molly
- 8 years. Cleo King played Reno Wilson's grandmother. Reno was 39 at the start of season 1 in 2010
Cleo King relied on cloths and wigs to appear older. Her is an interview at the begging of the season.