According to industry data, ITV saw its share of the key youth demographic fall by 4% last year to a low of 37%.
While ITV's share falls, satellite channels have seen their share rise, growing by 4.3% to 31.3%.
The latest news will add to the bad news ITV has already received in recent weeks, as it was revealed that the broadcaster lost out in the ratings war to BBC for the first time since the network was launched.
BBC flagship channel BBC1 drew a 26.8% share of the audience, compared with ITV's 26.7%. The news will bring little cheer to the commercial broadcaster, which faces another significant shortfall in advertising revenue.
It was revealed last week that ITV has also failed to meet self-imposed targets it set itself 12 months ago, key among which was to maintain its 7.5% peak-time lead over BBC1.
ITV saw seen that lead slump to 6.9%, which came as a bitter blow to the commercial broadcaster as it sought to attract much-needed advertising revenue.
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