At 78, actor Anthony Quinn fathered the first of two sons by his secretary, who he later married, for a total of 12 children give or take. I believe the oldest known father during modern times was 101.
A college friend's father, from northern Saskatchewan, having a polygamous lifestyle as a French Canadian Indian, had married his last wife at 73, a 14 year old girl, who felt honored. Already the father of more than 40 children by 24 wives during his lifetime, he gave her three sons over the next ten years, the last a year before he passed. At the time he married her he had 9 other living wives. The man had become a multi-millionaire during his lifetime from furring and mining. All his children were college educated, all set up in professions or businesses of their choices. All his wives adored him.
My friend is still a leading fashion illustrator in Europe with three wives, one in France, one in Spain, a third in NYC, each lovelier than the other. He has 12 children by the three and one who passed. They each know about the others and live well. He claims he keeps them in different countries for his personal peace. Who am I to argue. Today he spends most of his time in Majorca with a 32 year old mistress, drop dead gorgeous. He's 70.
I'm on my second, married more than 5 years after the first passed. More than complicated enough for me, one at a time.