This game compares the year of each player’s earliest recorded club-match appearance in the current Transfermarkt performance feed.

• The figure is the earliest club-match year found in the performance records, excluding national-team competitions.
• This is a first recorded competitive-club appearance year, not a youth-signing date and not a hand-curated biography field.
• The game uses the year rather than the exact debut date, so SAME becomes part of the real distribution.

Football careers begin long before history notices them. This number starts when the source finally does.