10/10/09 to 5/10/14 = 4 years 7 months = 55 months
5/10/14 to 5/26/14 = 16 days. Hard to say exactly how many months, because a month can have 28, 29, 30, or 31 days. 16 days is, very roughly, about 1/2 of a month though. Call it 0.5 months
Answer: about 55.5 months.