All three at least 3 years or more younger at time of purchase.
Havertz, donkey, but German international, everyone said was shit and crazy money.
Hojlund, didn't know much about prior to United so can't really comment. Seemed crazy for a 19 year old though but United throwing fees and wages all over hoping something stuck. They repeat each window so doesn't seem to matter if a player works out.
Nunez, was £73mil, 4 years younger than Solanke and coming off 26 goals in 28 games in the league. Pricey but seemed a good purchase for them at the time.