The English apprenticeship system has a structural problem: it was built to train young workers but now primarily subsidizes mid-career upskilling for adults. Under-19 apprenticeship starts have nearly halved in a decade. Over-25s now account for more than half of all new apprenticeships. The government's proposed fix is a price wedge — not a prohibition, but a 25% co-investment requirement for any employer training someone over 25. The mechanism is straightforward. The £4bn growth and skills levy pot would continue to cover 100% of eligible training costs for 16-to-24-year-olds. For older apprentices, employers would draw only 75% from their levy pot and fund the remaining quarter themselves. The change is being developed for a phased launch from September 2027, giving firms two years to adjust. This is a direct response to the failure of Labour's flagship foundation apprenticeship scheme, which has enrolled just 160 young people in its first eight months against an ambition of 30,000 over the parliament. That is a 0.5% hit rate against target — a catastrophic shortfall that signals the current incentive structure is fundamentally broken. The political context matters. Youth unemployment has risen to nearly 1 million NEETs. Andy Burnham has made youth jobs central to his agenda. Alan Milburn's review into the youth employment crisis is due in autumn, and Chancellor John Healey is preparing budget measures to address the problem. The 25% co-investment rule represents the cheapest available lever — it redirects existing funds rather than requiring new spending, critical given the backlash over employer national insurance hikes. Employers will resist. They were explicitly promised they could spend levy funds as they saw fit. The Fabian Society has proposed an alternative — raising the levy rate from 0.5% to 0.7% to generate an additional £2.5bn — but ministers are unwilling to heap more costs on businesses. So the cost gets shifted within the existing pot rather than expanded. The deeper question is whether a 25% price differential is enough. Employers train older workers because older workers are immediately productive and less risky. A 16-year-old apprentice requires supervision, mentorship, and tolerance for lower output — costs that don't show up in the levy but are very real. The price signal addresses the subsidy structure but not the underlying preference for experienced workers. If this works as intended, it nudges marginal decisions — the employer who was indifferent between a 23-year-old and a 27-year-old apprentice now has a financial reason to choose the younger candidate. If it doesn't work, it simply reduces total training volume by making older apprenticeships more expensive without generating enough new youth starts to compensate. The 160-versus-30,000 gap on foundation apprenticeships suggests the problem may be deeper than price.