Each spouse who has a policy can take the deduction up to the dollar limit for his/her age. Thus, if both spouses are age 71 and they each pay premiums in 2015 of at least $4,750, they can deduct $9,500 on their 2015 joint return ($4,750 each, the maximum deduction for 2015).
A tax triggered if certain tax benefits reduce your regular income tax below the tax computed on Form 6251 for AMT purposes.