My wife & I took 2 weeks of classes in Samara, Costa Rica - Intercultural Language school this past winter. The classes are 1/2 day's but the opportunity to take part in extra ciricular activities at the school allows you to imerse yourself in spanish for the complete day.
Ages of the students ranged from 18 - 75 years of age. We are in our fifties and had a small class with 6 students and we weren't the youngest or the oldest.
e-mail: info@interculturalcostarica.com