"X" also grew up watching Thundercats, so….

Thundercats first aired 1.23.85

Thundercats last aired 9.30.88

Show was most popular among boys aged 7-14.

That means people born between 1972 and 1982.

Flynn too old (1958)

Pompeo too old (1963 unless he watched at West Point)

Parscale fits (1976)

Kushner fits (1981)

Ivanka fits but a woman (1981)

Miller too young (1985)

Why did Q give this timeframe clue?