Answer:
Well chair is the usual word - or an armchair, if it's a single seater of the type that goes with a sofa. Not all chairs with arms are called armchairs, strangely. Dining chairs with arms are called carvers, and office chairs with arms are just called office chairs.
Explanation:
there are many other ways to say old without saying old! here are a few:
antiques (most likely the best answer)
aged
faded/worn
enfeebled