| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:42.36 | NEOR Top Fish #1 | 2025-11-09 |
| 100m Breaststroke | 1:45.38 | NEOR 2 2026 | 2026-01-24 |
| 100m Freestyle | 1:18.52 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 100m IM | 1:34.90 | NEOR 2 2026 | 2026-01-24 |
| 200m Breaststroke | 3:44.08 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 200m Freestyle | 2:56.70 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 200m IM | 3:25.08 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 50m Breaststroke | 47.17 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
| 50m Freestyle | 35.70 | 2026 Dave Kensit Memorial SC Championship | 2026-02-06 |
Lajeunesse, Olivia's top personal bests include 100m Backstroke (1:42.36), 100m Breaststroke (1:45.38), 100m Freestyle (1:18.52), 100m IM (1:34.90), 200m Breaststroke (3:44.08).
Lajeunesse, Olivia swims for Equipe natation Sturgeon Falls.
Lajeunesse, Olivia has competed in 5 meets.