Are elderly more likely to get sicker from bird flu?

Yes. The elderly are especially likley to have complications of influenza. Other chronic illnesses may be present and recoverey longer.
Yes. The elderly, infants and kids, those with a lowered immune system (hiv, cancers, etc), and pregnant women are much more likely to get complications from any type of flu. That's why flu vaccines are so important- even if you don't fall into one of these categories, you may be around someone who does. Give your grandmother a poem for the holidays, not the flu.