If someone received MenACWY vaccine at age 10 years and a dose of MenACWY before the 16th birthday, will they still need a booster dose at age 16?

Yes, they should receive a booster dose at age 16. A booster dose of MenACWY is recommended at age 16 years even if 2 (or more) doses of MenACWY vaccine were received before age 16 years. First-year college students living in a residence hall who have not received a dose of MenACWY on or after age 16 years, should also be vaccinated.