Hello Joanne, Just trying to help you with your query. If it's of any interst I found your grandfather Marvin aged 10 years old in the 1930 census. I haven't looked further back but can do if you wish. I think Wayne was two years younger than Marvin !!
-==- 1930 census= Name: Guy W Gooch Home in 1930: Salisbury, Chariton, Missouri View Map Age: 39 Estimated Birth Year: abt 1891 Birthplace: Missouri Relation to Head of House: Head Spouse's Name: Bansye Gooch Race: White Household members=
Guy W Gooch 39 Pansye Gooch 32 Marvin Gooch 10 Wayne Gooch 8 Billie L Gooch 5 Thelma L Gooch 3 2/12 --=-=
P.S. I had a look at 1920 census AND FOUND THE FOLLOWING=
Name: Marvin W Gooch Home in 1920: Salisbury, Chariton, Missouri Age: 0 [3/12] Estimated Birth Year: abt 1920 [abt 1919] Birthplace: Missouri Relation to Head of House: Son Father's Name: Gus W Gooch Father's Birth Place: Missouri Mother's Name: Pansy M Gooch Mother's Birth Place: Missouri Marital Status: Single Race: White Sex: Male Neighbors: View others on page Household Members: Name Age Gus W Gooch 27 Pansy M Gooch 21 Marvin W Gooch 0 [3/12]