Yep, on first glance it's not great news, but my understanding is that 'strong stimulation' i.e. giving more drugs, is what might be causing the problems. A different type of intervention might be needed for older women, not simply blasting the ovaries with more and more drugs.
The good news (and this is a bit "silver lining at all costs") is that the chromosomal problems are not inherent, but possibly caused by the drugs. Some more subtle treatment is needed - now the boffins just need to figure out what it is!