If the tank is large enough there's a chance. Most people would say don't risk it, especially if you don't wanna risk losing your old lady clown. Maroons can be evil anyways.
Age is not an issue (not that 15 years is old for a clownfish) but rather feeding, environment and a general lack of stimuli. Bored clowns may never spawn. They need some excitement.
Maybe take a picture of the tank and post it here.
It would also help to get a bit more info on what else is in the tank>
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