Thank you, it's at least 8 years old so I can't imagine that there are many left! 
There is a decent amount of singles left just not that many go up for sale. Do you have any other single bitbills or is this your only one?
This is the only one I have. Sorry I stand corrected I just checked blockchain.info and it looks like it is slightly under 8 years old. https://www.blockchain.com/btc/address/1F6QfciSkNntX9ajqpEAwXqP66YUa84Gzw