(1) The amount of maintenance is determined in accordance with the marital life circumstances. The maintenance comprises all the necessities of life.
(2) Necessities of life also include the costs of appropriate insurance in the case of illness and need for long-term care and the costs of school education or vocational training, further training or retraining under sections 1574 and 1575.
(3) If the divorced spouse has a maintenance claim under sections 1570 to 1573 or section 1576, then necessities of life also include the costs of appropriate insurance for old age and for reduced earning capacity.