[0] http://www.citizenvox.org/2012/10/15/opt-out-of-paypal%E2%80...
Edited for minor formatting.
Here are some citations:
"American Express Co., et al. v. Italian Colors Restaurant." Oyez, https://www.oyez.org/cases/2012/12-133. Accessed 29 Apr. 2017.
"AT&T Mobility LLC v. Concepcion." Oyez, https://www.oyez.org/cases/2010/09-893. Accessed 29 Apr. 2017.
"The End of Class Actions?" Arizona Law Review, http://arizonalawreview.org/fitzpatrick/
Gilles, Myriam and Friedman, Gary (2012) "After Class: Aggregate Litigation in the Wake of "AT&T Mobility v Concepcion"," University of Chicago Law Review: Vol. 79 : Iss. 2 , Article 3. Available at: http://chicagounbound.uchicago.edu/uclrev/vol79/iss2/3
Edited to add the third and fourth citations.
In most countries, arbitration clauses are prohibited in B2C contracts. You can't prohibit consumer from suing you.
If PayPal closed his account because it was created before he was 18, did they do so because they believe that he didn't have capacity when he signed up? If that is the case then it makes you wonder if any of the TOS apply