Is IPv6 available to me? Should I care?

[Richard Owlett]

I date from era of CPUs with 12AX7s powered via 5U4GBs with attached 
KSR33. I bump up against my 2GB/mo bandwidth allowance maybe 3 times a 
year ;}

How would I check?
For such as I, is there a relevant distinction between IPv4 and IPv6 
except address space?