Welsh language campaigners say urgent action is needed to turn the fortunes of the Welsh around.
The census published last year found the number of people speaking it in Wales has fallen in the last decade so today a rally was held in Merthyr Tydfil calling on politicians to act, as Rob Osborne reports.
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Philip Thomas was a 10-year-old pupil at Pantglas Junior School in Aberfan when a coal tip collapsed and slid downhill.
ITV News speaks to Jeff Edwards - who was eight years old when he became the last survivor to be pulled from the rubble.
Until 21st October 1966, Aberfan was a place that most of the world had never heard of.