Well, there's a difference between "age" and "professional/premium/consumer"
The 1V is about 12 years old. It was the professional camera when it came out, nothing could touch it for AF, fps, sealing, etc, and it had a huge (for the time) pricetag.
It had the 45pt AF (that it got from the EOS3), that was inherited by the cameras that came after it: 1D, 1Ds, 1D2, 1Ds2, 1D3, 1Ds3, 1D4.
It had the 10fps that was inherited by the cameras that came after it: 1D, 1D2, 1D3, 1D4.
The EOS 5 got the 5-pt AF from the EOS 1n. When the 5D came out, it got a new 9-pt AF. That then got inherited by the 5D mk2.
The 5-series has always had second-best technology compared to the 1-series, film or digital. Sometimes it has the same tech (like the 5D mk2 and 1Ds mk3 sharing a sensor, or the 1DX and 5D mk3 sharing the AF), but generally something else has to be crippled (like the 5D mk2 got a hopeless AF compared to the 1Dsmk3, or the 5D mk3 got less FPS, processors, and other features than the 1DX). But it's also had a much smaller pricetag in comparison...