Seattle Parks and Recreation runs a vast variety of programs through the community centers throughout the year. Activities include art, swimming, sports, camps, and so much more. Of special interest to many of my readers are Lifelong Recreation with all kinds of programs designed for people aged 50+ and Specialized Programs for those of all ages with disabilities.
Parks and Rec offers scholarships each year to qualifying individuals and families, including seniors and the disabled. Scholarships are based on income and family size, and can be applied to program/class fees in order to make them accessible to everyone. I believe the scholarships are sliding scale, meaning they range from small discounts to making programs entirely free, based on need.