Into the West
I've already heard 'Into the West' being compared to this series -- both were great for their respective 'times', tho I think Centennial is great for its scope -- 200 years, from the late 1700's to 1978.
tho the 70's make up jobs tend to be a bit over the top to get us to believe 'aging'
on the plus side -- we got Chad Everett's sideburns. Those things should be in the Smithsonian! They WERE the 70's!