I'm wondering if my 13 inch MacBook Air is having battery issues?
I would recommend using coconutBattery to monitor your battery life and record degradation statistics. For example, my MacbookPro is 21 months old, 142 cycles and has 94% of original capacity (6519 out of 6900). But Pro batteries are different from Airs, they degrade slower.

Here you can see how Air battery degrades over a year (recorded daily). Yours does not look different.