Flexible retirement features abroad.
D000367:Age Factors; D000368:Aged; D001530:Belgium; D005602:France; D005860:Germany, West; D006801:Humans; D007564:Japan; D008875:Middle Aged; D009664:Norway; D010415:Pensions; D012179:Retirement; D012943:Social Security; D013548:Sweden; D006113:United Kingdom