50+ years (huh?)
ARPANET started in 1968 and was formally decomissioned in 1990. Quoting the Wikipedia article:
Adoption of TCP/IP
The DoD made TCP/IP standard for all military computer networking in 1980. NORSAR and University College London left the ARPANET and began using TCP/IP over SATNET in early 1982.
On January 1, 1983, known as flag day, TCP/IP protocols became the standard for the ARPANET, replacing the earlier Network Control Protocol.
UCL is still online, and according to http://www0.cs.ucl.ac.uk/research/darpa/internet-history.html, it was already online in the early 1970s. So, someone may still have an UCL account from the ARPANET time. Not very likely, but also not impossible.
Alexander
--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
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