How old were they?

Mark Kastelic

C · Born March 11, 1999

Age in each postseason series

1. 2026 1st round (April 19, 2026), Bruins vs Sabres 2–4: 27 years, 39 days

Age in each season

1. 2021-22 (Senators): 22 years, 204 days to 23 years, 50 days
2. 2022-23 (Senators): 23 years, 204 days to 24 years, 50 days
3. 2023-24 (Bruins): 24 years, 204 days to 25 years, 50 days
4. 2024-25 (Bruins): 25 years, 204 days to 26 years, 50 days
5. 2025-26 (Bruins): 26 years, 204 days to 27 years, 50 days
6. 2026-27 (Bruins): 27 years, 204 days to 28 years, 50 days