why average earnings rise with age and fall at some point as the worker age (labour economics)?

Question

comment on research of myck 2007 and his suggestion that the reduction in average earnings of older workers in great britain and germany may be more apparent than real

Answer 1

People who do manual labor take easier lower paying jobs when they get old.

Answer 2

In a line with age (and time ofcourse) labor skill will increase and hence their value to company, as measured by their earning. But up to a limit, their productivity decline in harmony with physical decline, and hence their value to company, as measured by their earning