I'm 47 yr. old woman, 5'5", 135 lbs. i eat 2300 calories/day. i exercise moderately1/2 hr. 4x a week. is this an unusual amount of calories for woman?

Seems high.: But if you are not gaining weight then it is the right amount for you.

A bit unusual: But, sounds like you are maintaining your weight, so you likely have an unusual caloric expenditure each day too. Suggest not being concerned over the actual number of calories consumed, but, try tracking amount taken in minus amount used. High positive numbers will lead to weight gain. Negative numbers lead to weight loss.