The 43-year-old actress - who divorced ex-husband Brad Pitt in 2005 when she was 31 - admitted while having reached her forties is a "great" experience, she hadn`t enjoyed the previous decade of her life too much.
She said: "Forty`s great! Oh my God, my thirties blew! Forties are great."
Jennifer - who has been dating actor Justin Theroux since May 2011 - also joked the public are so fascinated with the idea of her becoming a mother, that she feels like she is having feuding "alien babies".
In a joint interview with her `Wanderlust` co-star Paul Rudd in America`s GQ magazine, she explained: "I`m still trying really hard to be friends with it. It`s just a weird time, I think. The tabloids, instead of being about alien babies and stuff, it`s my triplets, quadruplets, marriages, feuds.
Paul added: "Are your quadruplets feuding with each other?"
Jennifer joked: "They`re feuding again. But it was amazing that Sarah Jessica Parker actually birthed one for me."
The actress admitted she has now come to realise that children might not necessarily be part of the "picture-perfect life".
She said: "I still kind of go with, if it happens, it happens. I`m calm and peaceful with whatever the plan is. It`s not something where I`m going, `I gotta have a kid!`
"Part of the picture-perfect life? I think that`s sort of cliché, isn`t it? Like, if you want to be happy, you should have the house, the husband, the kids ... Kids are messy!"