The course of the life is what we make of it and it takes many twists and bends. It is for the individual in the present a somehow difficult unit to grasp. The personal finiteness is a constant companion and part of the identity, but not in absolute value. The focus is on shorter timespans and immediate tasks. It is however for the collective an important unit. Much of the stability of society, a community even a family rests on the unit of the life cycle. Generations and the presence of the past bring with them the security and identity shaped through the collective memory.
Hagerstrand focused on this larger unit in his 'Survival and Arena' (1978) as discussed HERE. His visualisations show how the farm, as such the place, was maintained through the continuos 'life lines' of the individuals 'passing by', but it was less the distinct individual than the overall character of the sequence that defined the place.
However for individuals different aspects or events of the life have a 'place' changing character and one of them is definitely the moment the 'individual' transforms into a 'collective'. Of course this is culture based and depending on the individuals character and circumstances, however a certain trend can maybe be described. The concept of the family plays an important role her, but the 'arrival' of the child marks an uncertain moment. A moment that will be prepared, but how. Modelled on personal experience, from memory and peer information a tiny little world is constructed, a world for an new individual, a new generation - the nest.