Is it possible to reach a pace faster than 4:00 minutes per km in 1-2 years of training.
Master of Sports of International class in track and field athletics, winner of the Zurich marathon, participant of the Beijing 2008 Summer Olympics, multiple European Cup and Russian championships medalist, coach of the school “I Love Running”
The question is too general to be answered definitely. But I daresay that many things are possible.
You should realize that much depends on an initial fitness level. I mean it may take six months of training for one person to take part in races and run at the pace you mentioned and at the same time there is a possibility that another person will not be able to reach the pace at all.
And the age does not always play an important role here.
To reach your goal you should refer to specialists or try to learn a theory and endurance training methods. In this case you will be able to avoid serious mistakes in planning and your goal will be achievable.