Things that require valid ID:
Driving
Boarding an airplane
Doctor's office
At a hospital
When applying for a job
Pharmacy
Bank Transaction
Applying for school
Applying for store credit
Establish a utilities account for water and light
Purchasing a car
Car registration
Outpatient Testing
Medicare/Medicaid
Open a Retirement Account
Donate blood
Buy a gun
Social security services
Pawn shops
Writing a check
Using a credit card
Buying car insurance
Buying train tickets
Buying annual tickets to amusement parks
Volunteer at Non-profit orgs
Check out a book at a library
Applying for a professional license
Buy a house
Getting an apartment rental applications
And what else that requires an ID?