Mark turned fifty this year. He doesn't look fifty (but he does look old).
According to Rachel's video game, his brain is twenty years old. Possibly he had no brain until age thirty-one.

HIGHLIGHTS

Playing tennis in Golden Gate Park. Athlete’s foot cured. Learning the code for pineapple. Avoiding jury duty. A hot bitch. Lincoln giving a Mother's Day greeting. Answering a question about puberty. A new fragrance. A swinging fan . Considering changing his name. A new thing to do with your tongue. Wonders of nature. Existential status of Rigging Designers. Playing in a wine cave. No moving violations. Prescription sunglasses. Decent wine for two dollars. Giving blood = free ice cream. Stephen Colbert.