Constant Crashing

I have an iPod touch 4th generation. I have 16.5 GB available out of 28.5 GB and it is about 3 years old. It crashes constantly, I can barely open an app before it crashes again. I have reset it numerous times and tried many things, nothing works. In my diagnostics report there are almost 50 low memories crashes and just as many crashes that are application based. I don't know what to do and the frustration this is causing me, makes me wary of buying another apple product to replace it. Is it just getting old? Is there anything I can do?