It's almost right. Not really any age level. Just competitive games. Those being qualifiers or tournaments for Euro U17, U19, U21. I'd also be pretty sure the FIFA U17 and U20 world cup. So for example a player could play an U16 game or could play in the Toulon tournament or an u21 friendly or something similar and that wouldn't be considered as a competitive appearance for a nation. They could then add themselves to the FBR and declare for Ireland. That looks like the case with O'Hare as his only England youth cap was in a friendly tournament, so he is in FIFAs eyes an uncapped player.
To date, as far as I'm aware, Delap and Barry have similarly only played friendly matches for England, mostly due to timing. As far as I remember, England got a by into the elite stage of the u17s which meant they played friendlies between september and november and could only make their debuts in March and with covid those games were cancelled. They are now U18s for next season, so they won't be in a competitive age group but it's very possible they'll be fast-tracked to U19 level considering they're the two best U18s in that age group...
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