[5] On 22 February 2014, Lynch was captain of the Ardscoil Rís that defeated Scoil na Trionóide from Doon by 2-13 to 0-04 in the final of the Harty Cup.
His six uncles, Ciarán, Paul, Pa, Seán and Nigel Carey, were senior team mainstays during a golden era for the club in the 1980s and 1990s.
[9][10] After an unremarkable juvenile and underage career, Lynch was 17-years-old when he joined the club's senior team, stating: "I was in fifth year at school and was with the county minors.
"[11] An undefeated run through the 2015 County Championship campaign saw Patrickswell qualify for the final, with Lynch's side ultimately facing a one-point defeat by Na Piarsaigh.
On 23 July 2013, he lined out at wing-forward when Limerick won their first Munster Minor Championship title in 29 years after a 1-20 to 4-08 defeat of Waterford in a replay of the final.
On 22 July 2014, he won a second successive Munster Minor Championship title after a six-point win over Waterford in a final replay.
[20] On 30 July 2015, he lined out at left corner-forward when Limerick defeated four-in-a-row hopefuls Clare by 0-22 to 0-19 to win the Munster Under-21 Championship title.
[25] Lynch was just 19-years-old when he was drafted onto the Limerick senior panel by team manager T. J. Ryan in advance of the 2015 Waterford Crystal Cup.
[27] Lynch was a regular during the pre-season competition and ended the campaign by claiming his first senior silverware after a 3-20 to 1-16 defeat of Cork in the final.
[29] On 24 May 2015, Lynch made his first appearance in the Munster Championship when he gave a man of the match performance in a one-point quarter-final win over Clare.
[32] Lynch was again included on the Limerick panel for the 2016 season, but missed the team's two opening games in the newly created pre-season Munster League.
[33] Lynch was a regular starter in Limerick's 2016 National League campaign and made six appearances in total, including at left wing-forward in the 3-23 to 1-18 semi-final defeat by Waterford.
[34] Lynch combined his Mary Immaculate College Fitzgibbon Cup duties with Limerick's Munster League campaign at the start of the 2017 season.
[35] Lynch made five appearances for Limerick during the 2017 National League campaign, including at left corner-forward in the ten-point defeat by Galway in the semi-final.
[36] Lynch was again named on the 38-man Limerick panel for the upcoming 2018 season, however, he missed some part of the pre-season Munster League due to Fitzgibbon Cup commitments with Mary Immaculate College.
[41] Lynch ended the season by being named Hurler of the Year, while he also selected as midfield partner to Cork's Darragh Fitzgibbon on the All-Star Team.
[52] After the team came in for criticism for a poor league start, Lynch stated: "It’s just about staying focused really and working hard every week, every game that comes your way.