Well They All Come From Different Years
Spongebob Is 22 Years Old Born In 1986
correction Patrick is 24 two years older than SpongeBob
Squidward Is 28 Years Old Born In 1982
Mr.Krabs Is 68 years old
Mrs.Puff Is 55 Years Old Born In 1954
Sandy Cheeks Is 22 Years Old Born In 1986
Plankton Is 68 Years Old (Born On The Same Date As Mr.Krabs November 3rd 1942)
Pearl Is 17 Years Old ( No One Knows If Mrs. Krabs Apoted Pearl Or It Mr.Krabs Had Realtion With A Sperm Whale)
Gary The Snail Is 20 Years Old
Mermaid Man Is 76 Years Old Born In 1933 And Barnacle Boy Is 70 Years Old Born In 1939
Larry The Lobster Is 24 Years Old Lobster Don't Live Long
well that's it M&B Are The oldest and Patrick is the oldest out of the main crew
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Depending on what the current month & year is at the time someone reads this answer, use basic math skills to determine their ages.
Seth MacFarlane | Born October 26, 1973
Alex Borstein | Born February 15, 1973
Seth Green | Born February 8, 1974
Mila Kunis | Born August 14, 1983
Peter | 43 (unofficially he's 45 since he's 2 years older than Lois but his last stated age is 43)
Lois | 43 (as stated in Lois Comes Out of Her Shell)
Chris | 14 (as stated in Trading Places)
Meg | 18 (as stated in Meg & Quagmire)
Stewie | 1 (it should be noted he was seen celebrating another birthday in a flashback, so he's unofficially 2, but his stated age w/in the show is still 1)
Brian | 8 (as stated in Hannah Banana)
Since she's a character in an animated show, the real answer is "however old she needs to be for the current gag".
Unlike Stewie, who seems permanently stuck at 1 or so barring time shenanigans, Meg's age is a reasonably consistent progression from 15 (early episodes) to 18 (later seasons).
Your question cannot be answered as there are no characters named Louis Griffin on Family Guy.
Confirmed gay characters are Herbert, Jasper, Ricardo, Bruce and Bruce's yet-to-be-seen-only-heard-boyfriend Jeffrey.
No such character exists on Family Guy
There are several moms on Family Guy. Lois Griffin, Bonnie Swanson, Loretta Brown, Barbara Pewterschmidt, Carol Pewterschmidt, Thelma Griffin & many minor characters.
There is no mailman character on Family Guy