Does body fat flucctuate due to age?

I'm worried my bodyfat is going up. In a month it has gone from 17-19. I work out 5x a week and eat the same. My coach and trainer said it will fluctuate since I'm 20years old but I'm worried. When I took it I had a bottle of wate 30mins before and didn't eat prior. He used the omron... show more I'm worried my bodyfat is going up. In a month it has gone from 17-19. I work out 5x a week and eat the same.

My coach and trainer said it will fluctuate since I'm 20years old but I'm worried.

When I took it I had a bottle of wate 30mins before and didn't eat prior. He used the omron handheld body fat monitor.
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