Old ammo is fine, unless it was stored for years somewhere wet and damp.
As another member already said, I would not chance reloads because you don't know what was loaded. You can show the rounds to gents that reload and ask if they are (gun clubs, stores. etc).
Be aware of a blooper (at least that's what they used to be called). So if the powder is damp, or not enough was loaded, or the primmer was weak, etc, etc...you'll feel a light recoil or maybe no recoil when the gun is fired, and/or a weak sounding report (bang), and sometimes the shot leaves the barrel, and sometimes it might just roll out of the barrel. But anyhow, do not fire the next round, because you could have the wad from the previous round stuck inside the barrel, and if you fire the next round you will blow the barrel. You'll need to look down the bore and push the wad out with a cleaning rod, and then clean the bore if you get a wad from a blooper.