In its latest trading update, the pub group reported an 8.3% increase in like-for-like sales in the year to date.
The younger generation are drinking Guinness while the older generation are driving coffee sales, the boss of Wetherspoon has said.
In its trading update for the 13-week period to 28 April, the pub giant reported an 8.3% increase in like-for-like sales in the year to date, which includes the bank holiday.
Total sales increased by 3.3% in the quarter and by 6.5% in the year to date.
Sales were supported by increased demand for traditional ales, especially Abbot Ale, Ruddles Bitter and Doom Bar, as well as the popularity of wines such as Villa Maria Sauvignon Blanc, which Martin said had been "on the comeback trail".
"The gods of fashion have smiled upon Guinness, previously consumed by blokes my age, but now widely adopted by younger generations," Martin said.
Wetherspoon’s younger clientele have also increased sales of Au Vodka from Swansea and XIX flavoured vodkas, which have been promoted by YouTubers Sidemen.
"Sales of Lavazza coffee are also increasing. Free refills are thought to be responsible for spontaneous exhibitions of breakdancing among retired customers," Martin added.
In the year to date, Wetherspoon has opened two pubs and sold or surrendered to the landlord 18 pubs, 17 of which remain on the market.
These sites were selected because they were "smaller and older" or located in areas "where the company has a second pub in reasonably close proximity", the group said.
The shuttering of these sites resulted in a net cash inflow of £6.8m.
Wetherspoon has a trading estate of 809 pubs.
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