We live longer and we are more active when we retire than previous generation. The more you have prepared for your retirement life, the better it will be. It is therefore a good idea to consider your retirement well in advance.
Generally, you will need about 80% of your final salary when you retire, as you save about 20% when you no longer make pension contributions, pay membership fee to an unemployment insurance fund, etc. Apart from that, your financial needs will often not change much.