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The rear derailleur freewheel/cassette and chainwheels are probably the first to be changed on a bike.
At least it would be the earliest date that the bike could have been made.
Of course, all this assumes the bike has the original component.
The most likely components to be original are the stem, handlebars, seatpost, and brakes.
Although GRC's DNS Benchmark is packed with features to satisfy the needs of the most demanding Internet gurus (and this benchmark offers features designed to enable serious DNS performance investigation), the box below demonstrates that it is also extremely easy for casual and first-time users to run: Unless you're a super-guru, PLEASE really do read the “Conclusions” tab once the benchmark has completed. So the first step required before anything can be done on the Internet is to lookup the site's or service's domain name to determine its associated Internet IP address.
Some people have initially been overwhelmed and intimidated by this benchmark's deep and rich feature set, and by the amount of specific detail it generates. Since nothing can happen until IP addresses are known, the use of slow, overloaded or unreliable DNS servers will get in the way, noticeably slowing down virtually all of your use of the Internet.
Links to further descriptive help, FAQ pages and resources for this benchmarkutility are located at the bottom of each page.