Yes.
If you had paid back in a week, this wouldnt be an issue.
Pay the man
You can't seriously expect a 13 year old from the Phillipines to afford $100?? That's a well paid month's wages over there!
Give this kid a break. Atleast he's actually paying you back unlike most of the scammers here and kudo's to him for coming back to try clear his name. It's the lender's fault for lending to him, if the price was $120 when he asked for this loan, would you have given it to him then?
Age doens't matter here, he lent it, it's not the lenders fault, I understand the lender has good intentions and is trying is best to pay it off, and that's good. And a 14 year old can easily afford 100$, I'm 14 and can afford way more then that, and no, it's not from my parents. The price increase was a risk the lender has taken. You lend a certain amount of currency, this currency has a certain value, this value can go up or down, but the currency you lent is the same.