Chester Zoo Zoo Visit, 18th October 2009

Franka is only 10 years old whereas Sangay is 18. That is why she is smaller.
 
This occurs in most animal species really. One that doesn't off the top of my head is snakes?

There's quite a few groups where females are (on average) larger actually- birds of prey and spiders also spring to mind.

I think the size difference between Sangay and Franka is more likely to be gender difference than age difference - I'd say a 10-year-old bear is going to be pretty much fully grown.
 
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