One of the RSS Alerts that I regulary receive on my email was this one:
http://bismarcktribune.com/news/state-and-regional/williston-volunteer-helps-seniors-veterans/article_6ecddd5e-6e48-11e3-afa3-001a4bcf887a.html
It is an inspiring story about a woman who helps the eldery in nursing homes for many years and is not going to quit. Reaction of seniors is the main thing that keeps her in. If you are looking for a reson to help, maybe you should try this: just start, do it once, and then follow your heart. Most probably you will not need reasons anymore.
Despite Christmas season is over, the old people still will be glad for your attention. Don't wait for special occasion or holiday to make your visit. Just come and that usual day will become a holiday for them!