Money changes all the time: not the actual shape of the coins or the colour of the banknotes, yet it does so because money is very personal and, just as your life changes, so do your finances.
Think about it: in about a decade you go from a child with pocket money to having a holiday job and negotiating your way through student life and starting work. Then there are some years of getting growing into your working life, enjoying the rewards and setting yourself up for your own family life. Before you can turn around and blink, you will be sending your children out on their own journeys and looking forward to your retirement.