(b) Except upon a written finding by the court that deviation beyond the time limits of this section are required in the interests of justice, if the length of the marriage is 20 years or less, general term alimony shall terminate no later than a date certain under the following durational limits:

1. (1) If the length of the marriage is 5 years or less, general term alimony shall continue for not longer than one-half the number of months of the marriage.
2. (2) If the length of the marriage is 10 years or less, but more than 5 years, general term alimony shall continue for not longer than 60 per cent of the number of months of the marriage.
3. (3) If the length of the marriage is 15 years or less, but more than 10 years, general term alimony shall continue for not longer than 70 per cent of the number of months of the marriage.
4. (4) If the length of the marriage is 20 years or less, but more than 15 years, general term alimony shall continue for not longer than 80 per cent of the number of months of the marriage.

(d) General term alimony shall be suspended, reduced or terminated upon the cohabitation of the recipient spouse when the payor shows that the recipient spouse has maintained a common household, as defined in this subsection, with another person for a continuous period of at least 3 months.

1. (1) Persons are deemed to maintain a common household when they share a primary residence together with or without others. In determining whether the recipient is maintaining a common household, the court may consider any of the following factors:

(f) Once issued, general term alimony orders shall terminate upon the payor attaining the full retirement age. The payor's ability to work beyond the full retirement age shall not be a reason to extend alimony, provided that:

1. (1) When the court enters an initial alimony judgment, the court may set a different alimony termination date for good cause shown; provided, however, that in granting deviation, the court shall enter written findings of the reasons for deviation.
2. (2) The court may grant a recipient an extension of an existing alimony order for good cause shown; provided, however, that in granting an extension, the court shall enter written findings of: