In the future, when we turn 50, we will each be given a ticket to a time machine and, just once, we will be able to go back in time and talk to our 25-year-old selves.

Even then, time travel will be expensive and wreak havoc with frequent flyer programs. So there will only be one trip. So what if we could? What would we say? What advice would we give?

I often wish I could do this. Just once. So, just in case the time machine ever comes along, this is the career advice I would give my 25-year-old self.

1. A career is a marathon, not a sprint

Chill. When we are younger we tend to be impatient. As you get older you realise there is no real rush. Life, and the careers we pursue to fill it and pay the bills, needs to be approached on a long-term basis. If you sprint you will wear out or start to resent work that you previously enjoyed. Allow yourself time to breath and grow. Things will come if you work hard and allow yourself time to get good at things. Always rushing only leaves you empty, and tired. It is fine to give yourself permission to take some time in the slow lane with the hat people. You will find yourself seeing things on the journey that you didn’t realise were there.

2. Most success comes from repetition, not new things

I remember hairdressing legend Stefan Ackerie telling me this in 2003. I had never really thought about it before. A few years later Malcolm Gladwell’s brilliant book Outliers was published, promoting the idea that you needed to spend 10,000 hours on something to become truly expert at it. This applied to the Beatles and their Hamburg gigs and Bill Gates who, through a series of fortuitous accidents, ended up spending more time than almost anyone else on a computer.

The lesson here is get good at things before you try to move to the next thing. Genuine expertise belongs to an elite few. They seldom have superpowers. They usually have endurance, patience and take a long-term view. They also love what they do. If your find that, don’t let it go.

3. If work was really so great all the rich people would have the jobs

It is well established that almost nobody laments on their death bed that they didn’t spend enough time at the office. This seems obvious. Yet still we let contrived circumstances and fairly trivial issues keep us from important events like school sport days and kids getting badges for picking up rubbish. I wish somebody had schooled me about these priorities at 25. I can remember every sport day and certificate presentation I missed. I can’t remember any of the reasons I missed them.

4. Deprioritise your career when your kids are young

If you have skills, commitment and passion, careers tend to take care of themselves. Over the long haul, it really doesn’t matter if you have a few years when your career is in canter mode while you prioritise young children. This should apply to men and women. I was watching some video of my kids when they were little last week and I realised, again, that the little people in that video don’t exist in that form anymore. They have grown into pride-worthy adults but the tiny people with wonder in their eyes were just passing through. If you miss that time meeting deadlines and finishing reports, you never get it back. Childhood is fleeting. When it is in its formative stages, you get one chance.

You can also miss the chance to learn. Children teach you a lot more than you teach them. They give you a second chance to see the world for the first time through their eyes. And you will be astounded what you miss in the clutter of life. Hold onto those times while you can. As the nun sang in The Sound of Music, you can’t keep a wave upon the sand. And you look kinda ridiculous trying.

5. In the workforce, always act like you are 35

A recruiter gave me this advice some years ago. It is quite inspired. What she meant was, when you are young in the workplace, don’t act as a novice. If you are smart and competent, step up and do whatever you are capable of doing in a mature way. Similarly, when you are an older worker, don’t act like it. Approach your day with youthful energy. To quote a famous Frank Sinatra song: “You’re 35 and it’s a very good year”.