Late Developers in Football: The Relative Age Effect and Bloomers

If your child is small for their age, young for their school year, or a late maturer, it can feel like the academy door is already closing. It is not. One of the biggest biases in football selection works against late developers - and plenty of players have beaten it.

The relative age effect, explained

The relative age effect (RAE) is a selection bias favouring players born earlier in the selection year, who are chronologically older and often bigger. England's football selection year runs 1 September to 31 August, so a child born in September can be almost a full year older than a teammate born the following August.

The evidence in English academies is stark. Studies have found somewhere between 45% and 57% of academy players are born in the first quarter of the selection year, versus under 15% in the last quarter - when an even spread would be about 25% each. In one 2024 study, none of the players who turned professional were born in the final quarter of the year.

The crucial nuance

Here is what most people miss: the relative age effect is a selection artefact, not a talent predictor. The bias is strong at academy age groups but does not carry through to senior first teams in the same way. Being the biggest, strongest 11-year-old often just reflects early maturation - and within a single birth year, biological maturity can vary by up to five years. Coaches who mistake physical maturity for ability end up overlooking skilful late developers.

Bio-banding: football's response

To counter this, the FA and Premier League introduced bio-banding - grouping players by biological maturity (estimated percentage of predicted adult height) rather than chronological age. The Premier League ran the first bio-banded tournament in 2015/16 with Southampton, Reading, Stoke and Norwich, developed with Professor Sean Cumming at the University of Bath. It let late developers use skill, creativity and leadership instead of being out-muscled - and let early developers test themselves against bigger peers.

Late bloomers who made it

• Jamie Vardy was released by Sheffield Wednesday at 16 and played non-league football while working in a factory, before rising through Halifax and Fleetwood to Leicester - and a Premier League title.
• Harry Kane was loaned out repeatedly and did not break through at Spurs until he was given a regular run in 2014/15.
• Rickie Lambert was released as a teenager and worked in a beetroot factory before working his way up the leagues - and making his England debut at 31.

What it means for a late developer

If you are young for your year or a late maturer, focus on the corners that last - technical and tactical - be patient through the growth spurt (and mindful of injury risk around it), and seek appropriate competition. Being released or overlooked at 12 is often just a snapshot of physical maturity at one moment. Read the alternative routes to see how many players kept going - and get a fair read on your own potential with our free assessment, which is built to protect late maturers rather than penalise them.

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