Years ago, the average age of a student at Northern Virginia Community College was 31.
A lot of people attend at night, or pursue a new trade. I have a relative who returned to college after a job layoff, to finish the 4th year... finally graduated at the age of 55.
You could actually get up at George Mason University's graduation ceremony:
1) Have them ANNOUNCE your name,
2) They hand you a replica diploma...
3) They take your photo
4) Without ever having attended a class there!