She's been roasting the 2021 cast of Married At First Sight on her nightly YouTube recap show Martha's Red Wine Moments.

And while reacting to Wednesday's reunion dinner party, Martha Kalifatidis was shocked to discover the real age of one of the grooms.

She assumed Jason Engler was no older than 30, based on his behaviour on the show, and was stunned to learn he was in fact 35.

When Jason entered the dinner party alone - confirming his split from 'wife' Alana Lister after they'd committed to each other at the final vows - Martha let out a gasp.

'Good for Alana. Good for you,' the 32-year-old nodded, making it clear she didn't think Jason was good enough for the Queensland school teacher.

She added: 'Jason does have a lot of growing up to do. He's a bit immature for 30.'

A producer then corrected her, saying: 'He's 35.'

'Thirty-five?' a shocked Martha asked. 'Is he 35?'

Jason and Alana had agreed to stay together at their final vows, despite their relationship facing several obstacles over the previous few months.

They had enjoyed a healthy sex life at the start of the experiment, but things soon faltered as their personalities clashed and Alana disapproved of her husband's friendship with Bryce Ruthven - arguably the biggest villain of the season.

Despite this they pledged to give things a go at their final vows - which were filmed in December - but were unable to make things work and had split by the time of the reunion dinner party in February.

Jason, a construction estimator, was recently seen skateboarding with former MAFS bride Tamara Joy in Surfers Paradise, sparking rumours they're dating. 

Married At First Sight continues Sunday at 7pm on Channel Nine