Let's say you live to 80, half your life is 40 years. You only start working a decent job around ~22 years (4 year college degree).
22+40 = 62, pretty close to 70 already. Assuming some people die early, so others have to pick up the slack, some people work part time, etc. and you end up pretty damn close to 70.
Let's say you live to 80, half your life is 40 years. You only start working a decent job around ~22 years (4 year college degree).
22+40 = 62, pretty close to 70 already. Assuming some people die early, so others have to pick up the slack, some people work part time, etc. and you end up pretty damn close to 70.