My boyfriend is three years younger ... When will he want to "trade me in"?

Anonymous
My boyfriend is three years younger than me. He is fit and has a good job. When will he want to trade me in for a younger model? I know that, by having some money, you can always find a girl 10-15 years younger who will do anything to get her hands on it. Should I just consider this something temporary (we've been together about eight months) or actually consider a real future? I'm going to be turning 30 this year, and I know how disgusted guys get with women of my age.
My boyfriend is three years younger ... When will he want to "trade me in"?
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