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1.
The lower age limit for one's girl- or boyfriend, below which the relationship becomes creepy. Found by the following formula:

creepiness limit = 0.5x(your age) + 6

Breaks down when you're below age 13 or over 65, approximately.
Eg. the creepiness limit for a 30-year-old would be 21, but the creepiness limit for an 18-year-old would be 15.
by Dr McSanta November 06, 2007