With regard to instruments aging: cheap instruments age a lot more than expensive ones, and well-kept old instruments age very little. My own instrument is a special build from 1960 custom-made for a soloist. Its action is noisier and heavier than that of new instruments of similar class. Its sound and responsiveness, however, is of the kind where you forgive a lot.
Which takes me to the next point. It is actually a chromatic button accordion. While you have not yet invested significant time into playing, think about the decision to play that rather than a piano accordion.
The main advantage of a piano accordion is that it looks like a piano. But all the mechanics and mass and leverage that make a piano keyboard good for piano playing are not useful for an accordion as the keyboard is not used for delivering the sound energy but for controlling valves. The principal means of attack/volume control is the bellows. And where one does employ the keys or buttons for dynamics (mostly interesting for controlled phrasing in one hand only which one cannot do by the bellows while sustaining notes in the other hand), one wants minimal mass and mechanics interfering with controlled throttling of airflow.
It is probably not an accident that those nations having an accordion folk music tradition very often have a chromatic button accordion tradition, many of them also with a diatonic button tradition as well: Italy, France (with separate Basque tradition), Switzerland, Finland, Belgium, Russia, Serbia, Austria (with Vienna having created the Schrammelharmonika).
If you want to play in a band mostly by ear, the regular layout of the chromatic button accordion is a boon. If you play from score sheets (like in an orchestra), the piano button keyboard matches the notation better.
The mismatch of "controls" with notation makes tablature quite popular for amateur guitar playing. There is no equivalent instrument-specific notation for chromatic button accordion, so particularly polyphonic music requires quite a lot of getting used to when playing from score sheets. As one consequence, many amateur accordion orchestras (where playing from score sheets is essential) show piano keyboards even in countries with a button accordion tradition.
Another factor is size: I have a small two-reed chromatic button accordion that I can comfortably wear while standing and singing. Piano accordions in that size are mostly toys with something like 30 keys on the right hand. In contrast, this small 80-bass CBA has more than the full keyboard range of a full-size 120-bass 41-key piano accordion.