Daljinder Kaur and her partner Mohinder Singh Gill, 79, from India, had reportedly been trying for a baby throughout their 46 years of marriage.
Their son, named Arman, was born "healthy and happy" weighing 4.4lb on 19 April 2016.
The mother's exact date of birth is unclear, but she said she "is about 70" and claimed she "was not too old" to become a mum, according to the Guardian.
The Telegraph adds that Kaur told doctors she was around seven years younger than her husband, which would make her 72.
"God heard our prayers. My life feels complete now," she told Agence France-Presse when speaking about the birth.
"I am looking after the baby all by myself. I feel so full of energy. My husband is also very caring and helps me as much as he can."
Anurag Bishnoi, embryologist and owner of the National Fertility and Test Tube Baby centre in Hisar, where Kaur had IVF said the couple had experienced "set backs" to become parents.
He said the couple adopted a boy in the 1980s, but they lost contact with him when he went to study in America.
Kaur underwent two rounds of IVF and then had a gap of six months. The third attempt was successful.
"I first tried to avoid the case because she was very weak," Bishnoi said, according to the Metro. "But then her medical reports were normal and she was fit to conceive."