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<?php

$linha = '500 - Antonio: Idade: 35 anos';
$novaLinha = preg_match('#^\d#', $linha) ?
             sprintf('Id: %s', $linha) :
             $linha;

echo $novaLinha . PHP_EOL;
Success #stdin #stdout 0.02s 23700KB
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Id: 500 - Antonio: Idade: 35 anos
https://ideone.com/sHmctL
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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