This kind of sounds like when they went from John Pertwee to Tom Baker. I don't actually know how old Pertwee was in relation to Baker but Baker certainly looked much younger than Pertwee when he started.
Let's look at the ages and check it out:
01.) WILLIAM HARTNELL (1963-1966) Aged 55 the start Aged 58 at the end
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timeasmymeasure
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Date: 2009-01-03 11:28 pm (UTC)Let's look at the ages and check it out:
01.) WILLIAM HARTNELL (1963-1966)
Aged 55 the start
Aged 58 at the end
02.) PATRICK TROUGHTON (1966-1969)
46 to 49
03.) JOHN PERTWEE (1970-1974)
51 to 55
04.) TOM BAKER (1974-1981)
40 to 47
05.) PETER DAVISON (1981-1984)
29 to 32
06.) COLIN BAKER (1984-1986)
41 to 43
07.) SYLVESTER McCOY (1987-1989)
44 to 46
08.) PAUL McGANN (1996)
37 to...yeah, 37
09.) CHRISTOPHER ECCLESTON (2005)
41
10.) DAVID TENNANT (2005-2010)
34 to 39
11.) MATT SMITH (2010-????)
26 at start
so the ages have varied from Doc to Doc.