It seems to me you would want to retain your older teachers so they can set examples for new ones. Our younger teachers could learn valuable teaching skills that can be passed down for years to come.
But look at all the money they can save on retirement! Large corporations like to lay off those with 15+ years of service so they can save on benefits.
Anyway, the article states they are targeting those who plan to retire before the end of the year. If the article is correct, it is voluntary so they aren't really running anyone off.
As far as experience goes, the corporate world welcomes new people with fresh ideas. Education may be different.