Red Dwarf will always be a British classic, do love how it's still going on after all these years.
Even if the characters and the actors playing them may have gotten fat and old.
Funilly enough Doctor Who has addressed the whole 'actors getting old' thing.
For example, there have been quite a few episodes in which one of the Doctors has met another, but obviously due to these episodes taking place years after one of the Doctors actors has played the role they are obviously looking older than they did when they played the role.
So Doctor who came up with the neat concept of the 'time differential' being broken when two Doctors or more/The same timelord from different times in their own past or future meet.
The entire concept being a fun meta jab at the actors aging, which it being said that when the same timelord meets himself (which obviously meeting yourself should never happen in the first place) it causes a time paradox, with one of the clues that a paradox has happened is one of the same timelord, due to the 'time differential breaking' will be rapidly age until they are returned to their own time stream.
One of the more recent examples being the charity special in which David Tennant the 10th met the 5th, Peter Davidson, and upon admiring his past self jokes
'Well, your hairs much thinner and more gray, your face more saggy and you've put on some weight.. that's beacause of me though, once you get back to your own time stream time differential will repair itself and you'll go back to being young again'
Which is obviously a meta joke at how Davidson played the Doctor when he was 30, but is now playing this incarnation in his 50's.
And as one last interesting note is the time differential was even used to spawn an entire book and audio series for the 2nd doctor.
You see, there was an episode in which the 6th doctor met the 2nd, and oddly enoigh the 2nd was travelling alone with his companion Jamie (which never happened in the TV show as he always had another companion while he was with Jamie) happened to be wearing a slightly different kind of outfit to his regular outfit, and was noticeably older and his hair was almost completely gray rather than the pitch black that it was known for being.
This was later explained in books and audio that the 2nd doctor, just prior to being forced to regenerate by the Timelords, had been forced against his own will to work for the timelord for over a decade, during which time he visibly aged in the canon due his body getting old, and the Timelords pulled his former companion Jamie out of his timezone to help out the 2nd Doctor in doing the Timelords bidding for them, so it was explained later on why the 2nd looked older and had a different outfit in the canon of the show, which is pretty neat, even with the 2nd doctor in the episode with the 6th starting in his Tardis with Jamie being rather upset and complaining about the timelords, which adds it all together very well.
In the real world this was rather sad, as the 2nd Doctor Patrick Troughton at the time, was very ill and would die just over a year after the episode with the 6th aired, and he was only 68 years old.
He also happened to have been friends with the 1st Doctor, William Hartnell and the 3rd, John Pertwee, both of whom had died in recent times.
The episode writers had wanted to do a multi doctor story, but Tom baker number 4 refused, and number 5 Peter Davidson was busy filming other shows at time.
And as soon as they contacted Troughton about reappearing on the show as his Doctor, he apparently jumped at the chance, saying he would love to do so, even though he was in hospital at the time, and, once again, rather seriously ill.
But at least before he died he got to play the Doctor, his doctor, the character he clearly loved so much, even willing to do so while he was obviously far from his best health wise, which is rather heart warming.
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