Total retail spend via mobile devices in the UK 2014-2019, by age group

The source provides the following information:
"All numbers relating to expenditure and forecast expenditure of retail are taken from Conlumino’s own retail model. This is updated on an ongoing basis with inputs from official sources (such as the British Retail Consortium and Office for National Statistics), retailers’ results and trading updates, other secondary sources and industry surveys, Conlumino’s ongoing programme of research into consumer spending and habits, and underlying economic drivers and trends. Conlumino analysts both model and interpret this information to provide guidance on the likely future direction of retail expenditure at an overall, sector and category level."