But Matthew McConaughey, who celebrates the big 4-0 this November, isn't too worried.
In fact, this laidback Hollywood hunk is pretty pleased with the way life is going, especially being a dad to nine-month-old Levi, his first son with Brazilian model Camila Alves.
"I look at it as like they're new chapters," he says.
"Finding a woman I want to settle down with was a new chapter; having Levi - a new chapter. Same book. I don't believe that you close the hard cover and start over on another book. So in that vein, I'm not one for shutting a book and going 'oh that was then and this is now'. That was then and this is now."
Matthew's responsibilities in real life are a far cry from his latest character in new comedy Ghosts Of Girlfriends Past.
He plays womanising celebrity photographer Connor, who thinks nothing of breaking up with multiple women on a conference call while arranging his next date at the same time.
"Connor is used to being the confident guy, charming and funny, kind of edgy and always at the top of his game," Matthew says.
"He's really not out to hurt anyone, he just wants to have a good time. But he's also a guy who has lost his way and doesn't know it. He's been playing this role so long he doesn't even realise that in the end it's a lonely path."
Connor's romantic scepticism proves to be a bit of a downer on the eve of his brother Paul's wedding and doesn't exactly impress his houseful of guests, including his childhood friend Jenny (Jennifer Garner) who has no patience with Connor's philandering ways.
But that night Connor is given food for thought when he is visited by the ghost of his late Uncle Wayne (Michael Douglas) who shows Connor where he's going wrong by taking him through a revealing past, present and future odyssey of failed relationships.
"The ghosts were a big unrealistic thing, but that's just one of the things that made this one original," says Matthew, who is well known for his roles in romcoms like Fool's Gold and Failure To Launch.
"Because usually it's just guy-girl, guy-girl, guy-girl, you know we're going to split up, look at the poster, you know we're going to get together at the end but, hopefully, you're going to be entertained in how we get together at the end. This had a huge twist."
Matthew admits he also isn't too bothered about tying the knot with Camila at the moment.
"Am I getting married in the future? Not today," he says.
"I don't have any plans for it. It's not an institution I'm against at all. I'm actually for it, believe in it and have seen it actually be very, very healthy for many relationships. Some people go through it some great ways. It's just not something I plan on doing right now and that I feel like I need to do right now, but I'm not against it at all."
With several movies under his belt and a sex symbol image to boot, Matthew has had to get used to increased interest in his personal life - especially since baby Levi came along.
"It's inevitable and I personally don't choose to retreat or hide out," he says, despite having had a couple of brushes with paparazzi in the past.
"I didn't know what the hell stardom was about and didn't expect it," he adds.
"I didn't even know I was going to be acting until I was 21. I like how it's going. I'm happy. I love my job. I'm starting to like it more actually than I used to. Because I understand it a little bit better. I understand where and how my job's more like the rest of my life and I also understand where it's different and where it's separate. Sometimes I want it to be very seamless with where I am in my own life at that time. Other times, I want it to be a complete trip for me, a journey away from where I am. So I'm enjoying it."
Things may have changed for the actor in the past 20 years, but he says Levi's arrival hasn't altered his way of life.
He's still able to spend time on his favourite Californian beaches, doing his beloved surfing, and travel the world promoting and filming movies.
He seems pleased to be able to incorporate Levi into his often-nomadic lifestyle - albeit with a bit of extra planning.
"We've gone out of the country five times," he says.
"We've gone to Brazil twice, we've been to Italy and France and Germany. And we've gone 7300 miles on a road-trip in the Airstream (caravan) for 42 days - the three of us. So we've had a lot of the same adventures we would have had before Levi came along, we've now brought him along with us.
"Before we had him, there were quite a few people who would go 'Oh your life changes 180 degrees, it's like you lose your past life,' and that's turned out to not be true," he adds.
"In the vein that we're doing it, we're doing a lot of the same things. A lot more prep time for going somewhere and for when you're leaving so you don't just pop out and say 'I'll be there in five,' or come up with an idea and go 'yeah, I'll swing over'. It's a production. So that's a bit limiting on time.
"Its amazing how much energy mothers have. I don't know whether it's an instinct that takes over but the amount of sleep they can go without is unbelievable. I've changed crappy diapers. That's not a big deal. It's just how much instinctive energy takes over. And it just seems like no sweat but when you add it up its like 'where did you get that energy?'"
Matthew McConaughey - Extra Time
:: Matthew David McConaughey was born on November 4, 1969 in Texas.
:: People Magazine named him Sexiest Man Alive in 2005.
:: In 1997 he won an MTV award for Best Breakthrough Performance for his role in crime thriller A Time To Kill.
:: He is an avid surfer but only took up the hobby two years ago.
:: He loves the great outdoors.
"I'm happiest when getting out under the sun and staying in tune with Mother Nature's time clock. I like the city. I like the concrete. I like big business. At the same time, when I can go off with a backpack or off on a surfboard or even off on a run somewhere in the woods - that's where I'm really happy."
