Mathematics of selfishness

www.cnn.com/2004/HEALTH/parenting/11/10/mother.56.ap/index.html

A 56-year old woman has just given birth to twins.

When her children graduate from high school, she'll be 74.

When her children graduate from college, she'll be at least 78.

When her children are 30 and needing her help with the grandkids, she'll be 86.

Just because you can do something doesn't mean you should.