#1 The longest Marriage?
I seem to have two competing for first place here. My maternal grandparents were both born in 1899 and wed 1 January 1922. Grammie died 1 Dec 1989 and Grampa survived her by nearly another 10 years dying 7 Nov 1999. My calculations say they were married for 67 years, 11 months.
I have another set of direct line 6th gr grandparents (Lazarus Rowe and Mary Webber) who wed on 11 Oct 1752 and she died 27 Jun 1829 and he survived her by almost 3 months til 14 Sep 1829. All I know is that he was born in Jan of 1726 and she was born about a year later. That is one heckuva long time to be married

…. 76 years, 8 months, and 16 days
#2 The oldest Groom or Bride?
Wow I haven’t found any real old timers yet. Perhaps it’s the second marriage of my Paternal gr-grandparents…..he being a forty year old widower of 11 years and she being a 48 year old widow of 21 years. The odd bit here? They were already my gr-grandparents before they married! Go figure that one out!!
#3 The largest age gap between bride and groom?
Biggest gap so far is 20 years. Nathaniel Day born 1755 took as his second wife Rachel Pendexter who was born in 1775. They wed 15 Feb 1791. This union would prove to be the fly in the ointment for all the rest of my research as I manage to descend directly from one of Nathaniel first marriage offspring and then two of his second marriage offspring and my genealogy software groans mightily when producing certain reports! Not only that but my husband also descends from Rachel’s brother. Yup that makes us 6th cousins!!! Interesting also to note Rachel had a bit of struggle getting widow’s benefits of Nathaniel’s military pension too as they didn’t buy the fact that she had been truly married to him because of the age difference. Nathaniel passed away sometime after 1827 but Rachel survived him by a good many years. From court records we learn that she had no written evidence of the date of their marriage or of the dates of birth of her children but took family and neighbors to court with her to testify on her behalf. Her sister verified she had attended Rachel’s wedding and took care of her at the birth of her first child. This sister’s husband who was age 74 at this time furthermore testified he had known Nathaniel and Rachel for 50 years and that he could write and had records in his bible about his own marriage and births of his own children and then he compared those dates to those of Nathaniel and Rachel. A sister of Nathaniel’s had been married by the same Elder Chadburn and knew the date of the two weddings for they were very close to each other. Rachel’s pension was finally granted. Seems the government had always been a bit of stickler for detail ehh?
#4 The most Marriages?
Several 3’s but nothing more exciting than that.
#5a The most offspring with 1 partner?
Most I can find so far is 12 with no twins.
#5b From Multiple Marriages?
3rd Gr Grandfather George Fluck had a total of 13 and I suspect there is one more but can’t prove it from two marriages.