[1][2] He helped the Philippines reach the semi-finals of the 2010, 2012, 2014, and 2018 AFF Championships as well as participating in the 2019 AFC Asian Cup, the national team's first ever appearance in the tournament.

Born in Surrey, England, to an English father and Filipino mother, Younghusband joined the youth academy of Chelsea.

He turned professional in 2005 with the Chelsea reserve team, and spent time on loan with Danish club Esbjerg fB.

On 30 August 2007, Younghusband signed a contract with Danish top-league club Esbjerg, going on loan with the Danes for the rest of the 2007–08 season but he returned to Chelsea during the January transfer window.

"[3] On 19 August 2011, it was reported that Younghusband and his brother would be joining Loyola Meralco Sparks on three-year deals after the national club championship was over.

[4] On 15 October 2011, Younghusband made his debut for Loyola in the 2011 UFL Cup and fired a tournament-high seven goals in a 15–1 demolition of newcomer Team Socceroo FC.

[5] At the 2011 UFL Cup final, Loyola lost against the Philippine Air Force 2–0, although he won the Golden Boot Award with 25 goals in his 7 games.

[7] After the United Football League resumed after the AFC Challenge Cup, Younghusband scored a goal in a 5–0 win over Manila Nomads.

In the 2012 Singapore Cup, Younghusband scored the opening goal in a 3–1 victory over Burmese outfit Kanbawza which gave Loyola an advantage for the second leg.

After playing for the club for about six years, it was announced in July 2017 that Younghusband and his brother James were to be released by Meralco to join the Davao Aguilas in the then-upcoming transfer window.

[14] After Davao decided to dissolve its senior team in late 2018, Younghusband was reportedly in negotiations with Indonesian club PSIS Semarang in January 2019.

[16] He and his older brother, James, were eventually called up to the Southeast Asian nation's football squad, amidst much fanfare.

Younghusband participated in the ASEAN Football Championship and scored six goals in four appearances and ended up top scorer in the qualifiers.