I can't even remember my own mobile number and I've had it for over 2 years.
Only number I remember is the home number of the house I lived in 7 years ago. :lol
Todaythe only one i remember is 588-2300, Empiiiiire!
Only number i know is my mom and dad's home phone. But i keep back-ups of my contact lists, so i'm not really worried about losing my contacts.
I know mine and my parents. iCloud stores all your contacts, so even if I lost my phone (its practically cemented on my hand) I could just go online.
the only one i remember is 588-2300, Empiiiiire!