Dr Mariska van der Horst and colleagues from the EWL project have published a paper in Work, Aging and Retirement on the Pathways of Paid Work, Care Provision, and Volunteering in Later Careers
http://workar.oxfordjournals.org/content/workar/early/2016/10/07/workar.waw028.full.pdf
The paper provides an interesting and insightful view of the interplay between multiple activity domains in later careers.