Albert Morton, 69, from Sowerby Bridge, West Yorkshire, started his business in 1963 and is thought to be the area's last mole catcher.
Morton said: "I'd much prefer to get somebody and teach them how to do it, so it carries on."
He said the mechanical spring traps he used were the most humane way of killing the moles.
Morton, who works in the areas around Halifax, Sowerby Bridge and Hebden Bridge in Calderdale, said the job would suit someone who liked fresh air.
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"If there was any suffering or cruelty I wouldn't do it."
He has more than 300 customers ranging from farmers to golf course owners.
"This year it has gone manic but now I'm getting near to my sell-by-date", he was quoted as saying by the BBC.
He started to learn the trade in the 1960s when Morton's father suggested he should help the then mole catcher who was looking to pass his skills on.
Mole hills are caused as the mole, which spends most of its time underground, burrows towards the surface and can cause damage to grassed areas.