The 69-year-old singer presented a feature called My Countryside in which he reminisced about his childhood summers spent hop picking on the East Sussex/Kent border.
David was just one of many Eastenders who headed out to the countryside in the 1950s to escape the noise and pollution of the city.
During the segment, the 1970s pop icon recalled being overwhelmed by seeing cows in a field for the first time.
Those watching at home, who had not seen David on television for a number of years, were taken aback by his still-youthful appearance.
Countryfile: David Essex thrilled fans by presenting a feature on the show
Countryfile: David went to the East Sussex/Kent border where he used to spend many childhood summers
One viewer swooned: “David Essex on #countryfile. Still handsome.”
“#DavidEssex still as interesting and gorgeous as ever #countryfile,” another agreed.
Someone else remarked: “David Essex – now *that* is ageing veeery nicely #countryfile #silverfox.”
“David Essex reminiscing on #Countryfile, what's not to love. He's still got that certain something,” a fourth observed.
Countryfile: The former pop icon reminisced about seeing cows for the first time
Behind the scenes of Countryfile
Mon, November 7, 2016
Countryfile: : Explore the countryside with Ellie Harrison, Anita Rani & Matt Baker.
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Ellie Harrison stands at the top of Arthur's Seat above Edinburgh ready to lead The Children in Need ramble
While other viewers could hardly believe it was David they were seeing before them.
One person tweeted: “That's never David Essex. #countryfile.”
“B****y hell David Essex looks half Jeremy Corbyn, half Anthony Hopkins #countryfile,” another added.
A third said: “David Essex has morphed into a cockney Tom Jones. #Countryfile.”
Countryfile continues next Sunday at 7pm on BBC One.