Can you please supply pictures? What species of anthurium is it?

I live in a warm climate and have Anthurium which are at least 5 years old or more. It may be experiencing difficulty inside although it sounds like you are taking good care of it.

Like @Gina1960 said, a photo and the exact Anthurium name would help.

Exactly. I have many Anthuriums in my collection that were collected in the late 1990's to early 2000's that are still growing well.