I must have been about 9 when Dr. Who was first on the telly (my recollection was that the first episode was on about the same time that Kennedy was assassinated*), and the Daleks probably turned up in the first series (I can't remember). I watched quite regularly: William Hartnell, Patrick Troughton, Jon Pertwee, Tom Baker... how many years did that lot cover?
I also recall (possibly incorrectly) that the first episode was broadcast twice, on consecutive Saturdays, because the first one was so popular but lots of people missed it and requested that it be shown again.
*Just checked: Kennedy assassinated 22/11/1963. Dr. Who was first broadcast 23/11/1963.
Premiering the day after the assassination of United States President John F. Kennedy, the first episode of Doctor Who was repeated with the second episode the following week.