Pianos have a fairly limited life in terms of the musical performance they produce which starts to diminish around the 70 year point. Apart from a few unique instruments, pianos do not become antiques in the furniture sense of the word because they are purchased as a musical instrument to be played therefore one of the overriding factors in a valuation is the age and condition of the internal mechanics.
The serial number 14473 dates your piano to a build date of 1900, so it is 115 years old.
