'Do you think she's lying, Lewis?'
'I'm not so sure now.'
'Come off it man, when you're as old as I am you'll recognise a liar a mile off!'
Lewis remained doubtful: he was by several years the older man anyway.
I'm revisiting 'Last Bus To Woodstock' right now - mainly to look at technique - but this little exchange came as quite a shock to me. Lewis the older man!
This was the first Morse novel (1975), and the tv series began in 1987.
So now it makes me want to re-read one of Colin Dexter's later books - to see if he readjusted to mirror the casting in the tv screenplays. Poetic licence and all that!