It's not easy, to keep a band alive, for more than half of a century without a single hiatus. Most bands which started 50 years ago or more, took at least one hiatus or more, during their lifespan. Or they disbanded once and for all. Only a few among them were active continuously, even though there were changes among their line-ups.
(From most recent to oldest)
1) Canned Heat

Active for: 51 years
Number of active members among the Classic line-up: 3 out of 6
2) Scorpions

Active for: 51 years
Number of active members among the Classic line-up: 3 out of 5
3) The Dixie Cups

Active for: 52 years
Number of active members among the Classic line-up: 2 out of 3
4) The Troggs

Active for: 52 years
Number of active members among the Classic line-up: 1 out of 4
5) Rolling Stones

Active for: 54 years
Number of active members among the Classic line-up: 4 out of 4. (Well, Ronnie Wood joined in 1975, so he wasn't a part of the original line-up, but since Rolling Stones had multiple hits after 1975 as well, he could be considered a Classic member.)
6) Status Quo

Active for: 54 years
Number of active members among the Classic line-up: 2 out of 4
Note: Believe it or not, Status Quo were originally called The Scorpions.
7) Beach Boys

Active for: 55 years
Number of active members among the Classic line-up: 3 out of 5
8. Golden Earring

Active for: 55 years
Number of active members among the Classic line-up: 4 out of 4
9) The Temptations

Active for: 56 years
Number of active members among the Classic line-up: 1 out of 5
10) The Searchers

Active for: 57 years
Number of active members among the Classic line-up: 2 out of 5 (Although most of their hits were sung by Tony Jackson, Frank Allen has been part of the band, for more than 5 decades.)
11) The Crickets

Active for: 59 years (disbanded in 2016)
Number of active members among the Classic line-up when they disbanded: 1 out of 3
12) The Diamonds

Active for: 63 years
Number of active members among the Classic line-up: 0 out of 4
13) The Drifters

Active for: 63 years
Number of active members among the Classic line-up: 0 out of ? (It's really hard to define which's the classic line-up of The Drifters. More than 60 vocalists have performed as a Drifter, and they had successful hit from 50s till the 70s. But nobody from that era is a part of this group anymore)
14) Four Tops

Active for: 63 years
Number of active members among the Classic line-up: 1 out of 4
15) The Four Aces

Active for: 66 years
Number of active members among the Classic line-up: 0 out of 4
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